Yeah I fill up some whisky bottles with tap water and keep them in the cupboard. I guess in an insane scenario I might need to use it as drinking water, though I'd probably want to figure out how to boil that water first since it's been sitting there for awhile.

I have actually used that water... but just to wash my hands when they turn off the water in the building when they're doing some maintenance.

Sometimes some disaster preparedness is just useful for relatively banal circumstances.