Self-reliance · Water
A household of four moves around 300 gallons a day for drinking, cooking, washing, and flushing. Knowing the numbers is the start of every water system you build.
Guidance grounded in EPA drinking-water standards and FEMA household preparedness recommendations.
The numbers
Most households guess low. The EPA estimates the average American uses about 82 gallons per person each day indoors. Drinking and cooking sit near the bottom of the list. Toilets and showers sit at the top.
Per person, per day
Toilet flushing
24 gal
Showers
17 gal
Clothes washer
15 gal
Faucets (handwashing, brushing)
11 gal
Drinking, cooking, dishes, leaks
15 gal
Source: EPA WaterSense, residential water-use survey averages.
1 gal
Per person, per day · emergency baseline
FEMA's minimum during a disruption: a half gallon for drinking, a half gallon for cooking and basic hygiene. The other 81 gallons are the indoor comforts you'll do without if the line breaks.
For every 1 inch of rain, a 1,000-square-foot roof produces about 620 gallons of runoff.
A 1,500-square-foot roof in a region that averages 40 inches of rain a year sheds roughly 37,000 gallons. Most of that runs off without a barrel under the downspout.
How to think about it
Build them in order. Storage is the fastest to set up and the cheapest to start. Filtration is the next layer. Catchment is the long game, the system that keeps the storage full without buying jugs.
01
Food-grade containers
A two-week supply is one gallon per person per day, kept indoors and dated. Reliance Aqua-Tainers stack under beds. Larger drums sit in basements and garages. Rotate every six months.
Storage projects →
02
Gravity and pump
Storage gives you a buffer. Filtration extends it. A countertop gravity filter handles 2 to 4 gallons a day with no power. Know what the filter actually removes before you buy. Chlorine, sediment, lead, and pathogens are not the same problem.
Filtration projects →
03
Roof, well, surface
A rain barrel under one downspout costs about $130 and waters a garden. A full catchment system collects from the whole roof and feeds an indoor tank. A well already does this for many rural households, with one weak point: the pump runs on electricity.
Catchment projects →
The kit
Specific picks with honest prices. We update the list when something better shows up, and we link only what we'd put in our own basement.
Affiliate disclosure: New World Survival earns a small commission on purchases made through links on this page, at no cost to you. We only recommend gear we'd put in our own kit.
What goes wrong
01
A rain barrel without a screened inlet becomes a mosquito hatchery in about two weeks. Bugs lay eggs on standing water, larvae mature, and the next dry spell pushes them into your yard. The screen costs about five dollars. Replace the mesh once a year.
02
Filters do specific jobs. A chlorine-and-sediment cartridge does nothing for lead. A reverse-osmosis unit removes minerals the body needs alongside the contaminants it doesn't. Test first, then match the filter to the result. The EPA's annual Consumer Confidence Report for your utility is the free starting point. A lab test is the second.
03
Reusing sink or shower water sounds simple. The legal reality varies by state, and within the state by county. Arizona allows household greywater up to 400 gallons a day with no permit. California requires permits for most systems. Some jurisdictions prohibit it entirely. Check the rules before you plumb, and route blackwater (toilet waste) separately under any setup.
Project guides
Each guide walks one afternoon project. Cost ranges are honest, tools are listed, and the parts links are pre-screened against current availability.
Catchment · entry
One afternoon, 55 to 65 gallons, $80 to $150. The cheapest water infrastructure a household can add.
Read the guide →
Filtration
Sizing, placement, and the comparison between Berkey-style units, ceramic candles, and ZeroWater pitchers.
Read the guide →
Catchment · whole-roof
Gutters, first-flush diverters, the tank decision (above-ground polyethylene vs. below-ground concrete), and the legal status by state.
Read the guide →
Catchment · groundwater
How a residential well actually works, pump types, the power-loss problem, and the annual testing schedule the CDC recommends.
Read the guide →
Testing
The difference between strip tests, mail-in lab kits, and state-certified analysis. What to test for at what frequency.
Read the guide →
More coming
A state-by-state look at the legal landscape, plus a basic laundry-to-landscape build. Drafting.
Next steps
Starting out
One afternoon, about $130 in parts. After this, you have 55 to 65 gallons of garden water sitting at your downspout, and the muscle memory for the next system.
Start the rain barrel guideAlready storing water
Storage gives you days. Filtration and testing turn those days into weeks, and keep the supply honest year-round.
Read the filtration guide