Water is one of those things that makes you go "huh?" when you see the expiration date at the top of the bottle. Can water really expire? Water doesn't really go bad, does it? Why does bottled water have an expiration date? Can bottled water really go bad?
The thing you really need to worry about when it comes to bottled water is the bottle itself. The plastic bottle is what actually expires, and this can really alter the flavor of the water it contains.