Storage Vessels: Water Storage Containers
Part of Water Purification
Collecting water is only half the problem. Without proper storage, clean water becomes contaminated within hours, evaporates in days, or breeds disease-carrying mosquitoes within a week. The container you store water in determines whether it stays safe to drink. This article covers every viable storage option from salvaged modern containers to vessels you can build from scratch.
What Makes a Good Storage Vessel
Not all containers are suitable for water storage. A good vessel must meet five criteria:
| Criterion | Why It Matters | Failure Example |
|---|---|---|
| Watertight | Obvious — it must hold water | Cracked pot, rusted-through barrel |
| Opaque or covered | Light promotes algae growth | Clear glass jug in sunlight turns green in days |
| Sealable | Prevents contamination and mosquito breeding | Open bucket collects debris and insect larvae |
| Non-toxic | Container must not leach chemicals into water | Industrial chemical drums, lead-soldered vessels |
| Appropriately sized | Must match your storage needs and mobility | Too small wastes effort; too large cannot be moved |
Salvaged Modern Containers
In the first months after collapse, salvaged containers from the pre-existing infrastructure are the fastest and most reliable storage option. Know what to look for and what to avoid.
Safe to Use
| Container Type | Typical Volume | Advantages | Notes |
|---|---|---|---|
| HDPE water/juice jugs | 1-20 L | Food-safe plastic, lightweight, sealable | Look for recycling code #2 |
| PET bottles | 0.5-2 L | Abundant, transparent for SODIS, sealable | Code #1; avoid reuse for long-term (bacteria buildup in scratches) |
| HDPE/PP drums (food-grade) | 50-200 L | Large capacity, durable, sealable | Must verify previous contents were food/beverage |
| Stainless steel containers | 1-50 L | Non-reactive, durable, easy to sterilize | Heavy; excellent for long-term |
| Glass carboys/bottles | 1-20 L | Non-reactive, easy to clean | Fragile; keep in dark storage |
| IBC totes (intermediate bulk containers) | 1,000 L | Enormous capacity, built-in valve | Very common in industrial areas; verify food-grade |
| Ceramic crocks (food-grade) | 5-40 L | Traditional, cool storage | Heavy; check for lead glaze |
Dangerous — Do Not Use
| Container Type | Risk | Why |
|---|---|---|
| Industrial chemical drums | Chemical residue (solvents, pesticides, petroleum) | Cannot be adequately cleaned without laboratory methods |
| Galvanized steel (new or corroded) | Zinc leaching | Causes nausea, vomiting; worse with acidic water |
| Lead-soldered containers | Lead poisoning | Cumulative neurological damage, especially in children |
| PVC pipe (non-potable grade) | Chemical leaching | Stabilizers and plasticizers enter water over time |
| Containers with unknown previous contents | Unknown toxins | If you cannot identify what was stored, do not use it |
| Copper vessels (unlined) | Copper toxicity in acidic water | Safe for short-term; dangerous for long-term storage of acidic/soft water |
The Sniff Test Is Not Enough
Many industrial chemicals are odorless or leave no visible residue. A drum that looks and smells clean may contain pesticide residue that causes liver damage over months of use. If a container previously held anything other than food or beverage, do not use it for drinking water storage. Period.
Cleaning Salvaged Containers
Even food-grade salvaged containers need thorough cleaning before use.
Step 1 — Rinse with hot water. Fill the container with the hottest water available and let it sit for 30 minutes. Drain and repeat.
Step 2 — Scrub interior surfaces. Use a brush, cloth on a stick, or a handful of gravel and water (shake vigorously) to physically scrub the interior. Pay attention to corners, seams, and the area around the opening.
Step 3 — Sanitize. If available, rinse with a mild bleach solution (1 tablespoon per gallon of water). Let it sit for 10 minutes, then rinse thoroughly with clean water. If no bleach is available, fill with boiling water and let stand until cool.
Step 4 — Dry completely. Invert and air-dry before filling with storage water. Residual moisture in a sealed container promotes bacterial growth.
Building Storage Vessels From Scratch
When salvaged containers are unavailable or insufficient, you need to build your own. Several technologies are accessible without industrial tools.
Fired Clay Vessels (Pottery)
Clay pottery has stored water for over 10,000 years. It is the most proven low-tech storage solution.
Materials needed: Clay (with low organic content), water, a heat source (open fire or kiln), temper material (sand, crusite shell, or grog — crushed old pottery).
Step 1 — Prepare the clay. Dig clay from a riverbank, hillside, or exposed clay deposit. Remove stones and organic debris. Mix with 15-25% temper material (by volume) to prevent cracking during drying and firing.
Step 2 — Form the vessel. For water storage, the coil method is most reliable for large vessels:
- Roll clay into long ropes (2-3 cm diameter)
- Coil the ropes upward, one on top of another, to build the wall
- Smooth the interior and exterior with a flat stone or paddle
- Form a narrow neck to allow covering/sealing
Step 3 — Dry slowly. Let the vessel dry in shade for 3-7 days. Rapid drying causes cracking. Turn it periodically. The vessel should be completely dry before firing — it will feel warm-to-cool, not cold (cold = still contains moisture).
Step 4 — Fire the vessel. Build a fire around and over the vessel. Open-fire firing reaches approximately 600-800 degrees C. Maintain high heat for 2-4 hours. Let the vessel cool slowly in the dying fire — do not move it while hot.
Step 5 — Seal the interior (optional but recommended). Unglazed fired clay is porous — water slowly seeps through. This is actually beneficial (evaporative cooling keeps water cool) but causes losses. To seal:
- Apply a thin wash of very fine clay slip and re-fire
- Line the interior with beeswax (melt and swirl to coat)
- Apply pine pitch or birch tar to the interior
| Vessel Type | Capacity | Build Time | Skill Level |
|---|---|---|---|
| Small water jar | 2-5 L | 1-2 days + drying/firing | Beginner |
| Medium storage pot | 10-30 L | 2-3 days + drying/firing | Intermediate |
| Large storage urn | 50-100 L | 3-5 days + drying/firing | Advanced |
Wooden Barrels and Casks
Cooperage (barrel-making) is a skilled trade, but simplified versions are achievable.
Hollowed log method (simplest):
Step 1 — Select a large-diameter log. Minimum 40 cm diameter. Straight-grained hardwood (oak, chestnut) is ideal. Cut to desired height (60-90 cm for a practical barrel).
Step 2 — Hollow the interior. Use fire to char the interior, then scrape out the charred wood with an adze or chisel. Repeat until the walls are 3-5 cm thick. The charred interior actually improves water quality (activated charcoal effect).
Step 3 — Seal the bottom. Cut a flat disk of wood to fit the bottom opening. Seal it in place with pine pitch, beeswax, or clay. Alternatively, leave the log on a flat stone base sealed with clay.
Step 4 — Add a cover. Cut or carve a lid. It does not need to be airtight — it needs to keep out insects, debris, and animals.
Stone Cisterns
For permanent large-scale storage, stone cisterns are the most durable option.
Step 1 — Excavate a pit. Dig to the desired capacity. A 2 m x 2 m x 1.5 m pit holds approximately 6,000 liters.
Step 2 — Line with stone. Stack flat stones against the pit walls, mortared with lime-and-sand mortar or packed with puddled clay (15-20 cm thick).
Step 3 — Plaster the interior. Apply a thick coat of lime plaster (slaked lime mixed with fine sand) to the interior walls and floor. This seals the surface and prevents water from seeping out. Apply 2-3 coats, allowing each to dry before applying the next.
Step 4 — Build a cover. Stone slab, timber frame with thatch, or any solid cover that excludes light, rain splash, animals, and insects. Include an access opening with a removable cover.
Step 5 — Install an overflow. Near the top of the cistern, build a spillway or pipe that carries excess water away from the cistern base. Without overflow, heavy rain can flood and undermine the structure.
Storage Hygiene
Even the best container becomes a health hazard without proper maintenance.
Preventing Contamination
| Practice | Frequency | Purpose |
|---|---|---|
| Keep lid on at all times | Always | Prevents insects, debris, animal contamination |
| Use dedicated ladle or tap | Every use | Prevents dirty hands from entering water |
| Screen all openings with mesh | Permanent installation | Mosquito exclusion |
| Clean interior surfaces | Every 3-6 months | Removes biofilm, sediment, algae |
| Inspect for cracks and leaks | Monthly | Early detection prevents contamination and loss |
| Keep vessel off ground | Permanent | Prevents ground contamination and makes tap use easier |
The Dedicated Dipper Rule
Never put your hands, a shared cup, or any unwashed object into stored drinking water. Use a dedicated dipper (ladle, long-handled cup) that hangs on a hook beside the vessel. Better yet, install a spigot or tap near the bottom of the vessel so water flows out without any object entering.
Building a simple tap:
**Step 1 — Drill or bore a hole near the bottom of the vessel (5-10 cm above the base to avoid sediment).
Step 2 — Insert a tube or pipe. A hollowed bamboo section, a carved wooden spigot, or salvaged plumbing hardware.
Step 3 — Seal around the fitting. Use beeswax, pine pitch, or silicone (if available) to create a watertight seal.
Step 4 — Add a plug or valve. A whittled wooden plug, a cork, or a salvaged valve controls the flow.
Sizing Your Storage System
One large container is vulnerable — if it cracks or becomes contaminated, you lose everything. Multiple medium containers provide redundancy.
Recommended Distribution
| Use Case | Strategy | Reasoning |
|---|---|---|
| Single person | 2-3 containers of 20 L each | Redundancy; one can be cleaning while others are in use |
| Family of 4 | 1 large (100-200 L) + 3-4 small (20 L) | Large for bulk storage, small for daily use and transport |
| Community of 20 | 2+ large cisterns (1,000 L+) + individual household vessels | Central supply with household distribution |
Positioning Storage
Elevate when possible. Placing storage on a raised platform (1-2 meters) gives you gravity-fed flow through a tap — no lifting or pumping required.
Keep in shade. Direct sunlight heats water (promoting bacterial growth) and degrades plastic containers. Store under a roof, against a north-facing wall (in the northern hemisphere), or under tree cover.
Separate from contamination sources. Keep water storage at least 10 meters from latrines, compost, animal pens, or waste disposal areas. Uphill from these sources when possible.
Emergency and Portable Storage
Sometimes you need to move water, not just store it.
| Method | Volume | Range | Notes |
|---|---|---|---|
| Carried jugs (hand) | 5-20 L | Short (< 500 m) | Most common; hard on the body over distance |
| Shoulder yoke with 2 buckets | 20-30 L | Medium (< 1 km) | Distributes weight; requires flat path |
| Animal-drawn cart with barrels | 100-500 L | Long (km+) | Best for community water runs from distant source |
| Waterproof bags (hide, rubber, plastic) | 5-50 L | Variable | Collapsible when empty; good for pack transport |
| Bamboo sections (sealed nodes) | 1-3 L each | Any | Natural canteen; cut between nodes, seal open end |
The Bamboo Canteen
A section of large bamboo, cut just above and below two nodes, creates a natural sealed container holding 1-3 liters. Drill a small hole near the top for filling and drinking. Plug it with a carved wooden stopper or wrapped leaf. Bamboo is lightweight, durable, and naturally antibacterial. Carry several sections on a cord.
Key Takeaways
- The container matters as much as the water source. A contaminated storage vessel ruins clean water within hours. Choose non-toxic, sealable, opaque vessels.
- Salvaged HDPE drums and IBC totes marked as food-grade are the best post-collapse option. Never use containers that previously held industrial chemicals, regardless of how clean they appear.
- Clay pottery is the most accessible build-from-scratch storage technology. Temper clay with sand, form by coiling, fire in an open fire, and optionally seal the interior with beeswax or pitch.
- Hollowed logs make functional medium-term barrels. Charring the interior with fire before scraping provides both easier hollowing and mild water purification.
- Stone cisterns lined with puddled clay or lime plaster provide permanent large-scale storage for communities. Include a cover, overflow, and access opening.
- Never reach into stored water. Use a dedicated ladle or install a tap. The most common contamination pathway is dirty hands entering the storage vessel.
- Distribute storage across multiple containers for redundancy. If one vessel is contaminated or damaged, you do not lose your entire water supply.
- Elevate storage vessels on platforms for gravity-fed dispensing, keep them in shade to reduce bacterial growth, and maintain at least 10 meters separation from latrines and waste.