Water is tough to store. What I settled on was: - some water storage - remember you have a hot water tank with 40+ gallons - if you have warning, bleach and fill your bathtub for wash water and flushing toilets with a pail - a drip filtration system that can be filling a tank as you continue to make daily small quantity water runs to a local semi clean source. The bag, hose and filter setup I got from LifeStraw can filter up to 5000gal between filter changes