All packaged food comes with a nutrition label and an expiry date, offering consumers information of what the product may contain and till when it is suitable to consume. Even mineral water sold in plastic bottles is not barred from this list of packaged products. Although water can't rot or spoil, it's the plastic bottle and the environmental surrounding of the bottle that can affect its quality.
Placing plastic bottles under direct sunlight can cause the leaching of chemical compounds like bisphenol-A or BPA which is a hormone disruptor and can cause breast cancer, infertility in men, heart diseases and brain lining damage.
Recycling these plastic bottles may not be a good idea, as the quality of the plastic is porous in nature. This would make it able to absorb odours, gases, and even bacteria. It is a good idea to dispose off these bottles after 15-20 days.
If you do store bottled mineral water at home, keep it in a cool, dark place away from sunlight and ensure that the surface of the bottle is clean.