A household of four uses roughly 16 gallons of water per person per day for drinking, cooking, and minimal hygiene in an emergency-supply scenario. That works out to about 1,920 gallons per month, or roughly 60 days from a 1,000-gallon stored reserve. Four food-grade 275-gallon totes, a covered pad, a simple rotation plan, and basic treatment supplies put that reserve in place for under $900 all-in, and it requires almost no ongoing maintenance.
Buy food-grade and document it
For potable storage, food-grade with a clear wash record is non-negotiable. Specifically ask for prior contents in the food sweetener, edible oil, or fruit-juice concentrate family, and ask for the wash record by email. If the seller cannot produce one, walk away — there are plenty of properly documented units available in this market and there is no reason to take a chance on potable storage.
Pad and cover
Set the totes on a level pad — compacted gravel works, a concrete slab is better. Cover the array with a simple shed roof or a fitted UV cover. Direct sunlight on stored potable water grows algae within weeks even in well-cleaned totes, and UV degrades the bottle as discussed in our UV post. The shed does not need to be pretty; it needs to keep light off the water and rain off the pad.
Treat and rotate
For long-term storage, treat each tote with unscented household bleach at the rate of one teaspoon per ten gallons — about 27 teaspoons per 275-gallon tote. That gets the residual chlorine to roughly 5 ppm, which keeps the water safe for six to twelve months in a covered tote. Rotate the supply every twelve months: drain one tote into the garden, refill, re-dose. Cycling through four totes on a staggered schedule means you swap one every quarter.
- Four food-grade 275s with wash records
- Compacted gravel or concrete pad, level to within 1 inch over 8 feet
- Simple shed roof or fitted UV covers
- Unscented household bleach for initial treatment
- Brass full-port valves for the manifold
- A pressure or hand pump for draw, with quick-connect fittings
Drawing from the reserve
In an actual emergency the simplest draw is a hand pump on the bulkhead, dispensing into clean 5-gallon jugs for use indoors. If the household is on a well that lost power, the reserve can also be plumbed into a 12-volt RV pump to pressurize a small supply line. Either way, plan the draw method before you need it — practicing the drawdown once during a normal weekend is worth more than reading any guide.