If you’ve ever examined a bottle of water, you might notice that it has an expiration date. This is kind of weird right? Water doesn’t really expire right? You shouldn’t be worried about the water, but about the bottle.
Many companies bottle water using the same machines they use to bottle sodas and other beverages which do expire and should carry an expiration date. It’s easier and more efficient to simply put a stamp on all the bottles (whether needed or not) rather than dedicating a special machine just for bottled water.
Water is natural and isn’t going to go bad on its own, else every water in the world would expires then we all thirst and die. What might ruin things is the plastic that it’s wrapped in.
The plastic that water is packaged in usually polyethylene terephthalate (PET) for retail bottles and high-density polyethylene (HDPE) for water cooler jugs is slightly porous, so the water can pick up smells and tastes from the outside world.
Keep a case of bottled water in the basement for a year or so and it’s going to pick up some interesting flavors. There’s nothing better on a hot summer day than a 2007 Evian, with hints of dust and a crisp kitty litter finish!
As long as you store the bottles, unopened, like you would any other sealed food product, you’re probably fine.