I have one source that gives me cases of water that have reached their "sale by date". I put it in the barn, too! I even fill 2 liter soda bottles. You can never ever have enough water if your supply becomes damaged, or even worse, non-existant.
One other thing we have here is access to several mountain springs. Some have even been fitted with a pipe and some even have spigots. My sister also has a spring they use daily as does her mother in law. Most are within a couple of miles. Berkeley Springs, WV also has spring water access and many people get all of their drinking water from there - even if they don't actually "need to".