We're fortunate to have wells. Deep well on the house but we also have a hand driven sand point in the yard. I use rainbarrels all summer right up to when they freeze solid then I have a barrel we fill in the greenhouse. Hardly ever stays frozen because the least sunshine and that large black barrel warms up enough to take a bath in!I'm going to have to start looking around for them. Those are just too darned handy not to have a couple on hand. We are pretty low tech here. Yes we have electricity, but we also have a gas generator on standby. We heat with wood and have kerosene lamps. Our weak point is our water supply, We do have the ability to collect water, stock tanks, etc. We also have two ponds that would give us water to flush the toilet. I wouldn't use it to water the animals though due to the high level of bacteria/parasites/critters in it. The dogs drink it regularly but the chickens...well heck, it's probably cleaner then the mud puddles they like to drink of instead of there waterer.
But our drinking water is rural water/city water. If it goes down it would be good to know that we had some back up storage containers.