One thing we all can't live without for long is water.  I've had people say they are good, they have a well.  Some seem to forget their well or their access to it, may run on electricity.  So no, that isn't a sure thing.  Having water stored and then filters and a way to boil it, should be first priority.  There are barrels you can buy, jugs and other containers, that you can fill right now with