Her: "How long would you consider the shelf life of stored water safe for drinking purposes?"
(She is talking about city tap water she puts into containers herself. I believe commercially packaged water is probably germ-free forever until the packaging gets a hole in it. I don't think there are any problems drinking commercially packaged water that is many years old.)
Me: " Personally I would probably not worry if I knew I had personally cleaned out the bottles well, and it was six months or less since I filled them. Maybe when I get into a disaster situation I might be even less picky, I don't know."
Her: "DANG! So I guess drinking water stored 5 years or so would be out of the question?"
Me: If you don't think you'll rotate it for 5 years, I want you to understand that storing it is still a good idea. If you have room for it, do it.