Water is the most critical supply in any emergency kit — and the most overlooked when it comes to long-term storage. Here's how to do it right.
How Much Water Do You Actually Need?
FEMA recommends 1 gallon per person per day as a minimum — half a gallon for drinking, half for sanitation. For a family of four, that's 4 gallons a day. A 2-week supply means 56 gallons.
That's more than most people have on hand. Start with a 72-hour supply (12 gallons for a family of four) and build from there.
Don't forget pets — a medium-sized dog needs about a quart per day.
What Containers to Use
Food-grade plastic containers are the standard for home water storage. Look for containers marked with HDPE (plastic #2) — they don't leach chemicals into water over time.
Commercial water storage containers (5–55 gallon tanks) are purpose-built for this and the easiest option. They're opaque to prevent algae growth and have spigots for easy dispensing.
Pre-filled emergency water pouches are great for grab-and-go kits. They're compact, have a 5-year shelf life, and don't require any maintenance.
What to avoid: Old milk jugs (the plastic breaks down and harbors bacteria), glass containers (they break), and any container that previously held non-food items.
How to Fill and Treat Tap Water
Tap water from a municipal source is already treated and safe to store. Here's how to do it properly:
- Use a clean, food-grade container
- Fill directly from the tap — no need to add extra treatment if using municipal water
- Seal tightly and label with the fill date
- Replace every 6–12 months
If you're storing water from a well or other untreated source, add 8 drops of unscented liquid chlorine bleach (6% sodium hypochlorite) per gallon before sealing.
Storage Conditions Matter
Keep it cool and dark. Heat and sunlight degrade plastic containers over time and can cause algae growth even in sealed containers. A basement, pantry, or interior closet is ideal.
Keep it off concrete floors. Concrete can leach chemicals into plastic containers through a process called off-gassing. Store containers on wood shelving or pallets.
Away from chemicals. Don't store water near gasoline, pesticides, or cleaning products — plastic is semi-permeable and can absorb vapors.
How Long Does Stored Water Last?
Commercially bottled water has a shelf life printed on the label — typically 1–2 years. The water itself doesn't expire, but the container can degrade.
For home-stored tap water: rotate every 6–12 months. Mark the date on the container so you don't forget.
Emergency water pouches: 5 years, sometimes longer depending on the brand.
What If You Run Out?
Know your backup options before you need them:
- Water filtration straws or pump filters can purify water from streams, rivers, or rainwater
- Boiling kills pathogens — 1 minute at a rolling boil (3 minutes at high altitude)
- Water purification tablets are compact and effective for short-term use
- Rainwater collection is legal in most states and a solid backup source
The Bottom Line
Water storage isn't complicated — it's just often skipped because it feels like a lot. Start with what you can store today, even if it's just a few cases of bottled water and a couple of 5-gallon jugs. Build from there. In most emergencies, having 3 days of water puts you ahead of the majority of people around you.
