This is a good question. The fist answer would be NO. However, some people say that over time, the water picks up flavors from its packaging, and these flavors, combined with warm storage temperatures, contribute to the generation of unpleasant tastes. Unopened bottle of water go bad in the sense that they might not taste the greatest after several years of sitting on the shelf.

On the other hand, some states require all food and beverages, including bottled water, to state an expiration date on the label. According to the International Bottled Association, the FDA has not established a shelf life for water. As long as the packaging is intact and unopened, you do not have to worry about any type of bacteria or microorganism growing in the water. Just consider that after opening a bottle of water, bacteria and algae can grow inside if the water is not consumed within a couple of weeks.

Here is an interesting site where you can learn more about the FDA regulations for bottled water: