I have water stored, but we are on a well. Hubby said it’s easy to hook up the pump to one of our generators if we ever need to.
So far we always get by fine without even needing to use the water we bought and stored. I keep a couple 1 liter soda bottles under each sink for wash water. And drain the lines for drinking water.
Stick a do not flush on the toilet. That can be flushed by bringing in a bucket of water from the water collected off the roof. Then there’s always the hot water heater and holding tank, which we have never ever had to use even when we went several days without electric.
I always have some of those packages of body wash towels/wipes for use as needed which helps cut down on water use too.
Here's a view looking out one of those 1st floor office windows. The window glass held.
....and then the New Madrid earthquake happens...