In the UK bottled water comes with a "use-by" date which presumably allows for plastic leaching into the water. It's typically 12-18 months from date of purchase. The bottles can sit around in storage for 6 months or more before reaching the shelves, so water bought at different times can have the same use-by date.

It's a relatively expensive way to buy water and the use-by date is what makes it worth it to me.