Dum question. Does bottled wather have a shelf life?

[Uncle Timbo]

I think you'll find that the FDA mandates a use by date. So it's law.
If stored correctly its fine. If its allowed to get too hot it might have a musty taste.

 

[Halcon]

My 2.5gal jugs develop leaks after about 2 years. I've stopped stockpiling water now. Every time I checked on my ~5 jugs, two would have emptied themselves and warped the wooden shelves. If I need water I'll just use the drain valve on my 80gal hot water heater. That's a good stockpile...

As in milk jug containers or those cheesy plastic tabletop water containers with the spigot? If so, that is a big no no. that plastic is not made to last in fact, the protein build up from the milk is never thoroughly cleaned when flushing out the milk jugs and will affect the water over time.