If you’ve ever drunk a bottle of water, you might notice that there is an expiration date. That's weird, right? Water don't really expire, right? You should not be worried about the water, but about the bottle.
Many companies here in Jamaica bottle water using the same machines they use to bottle sodas and other drinks 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 water.
Water is something that's natural and doesn't spoil so easily, else every water in the world would expire and we would die from thirst. What might ruin things is the bottle that its package 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 under the sink 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 2018 bottle of Catherine Peak, with hints of dust and smell of the area!
As long as you store the bottles, unopened like you would any other sealed food product, you’re probably fine.