I have 150+ gallons stored in barrels in the shed for longer term, but I think I'm going to get a 5 gallon or 3 of water that we can pull out to use for whatever. Seems like a few water cooler jugs would be super handy.
Happened without warning, with me at work, kids at school, wife alone at home. So I'd consider it a good trial run.
Put the barrels inline to smething like a hose line so you can keep them constantly filled with fresh water