According to a Dietitian

The two year expiration date is more of guess of when the water bottle is most likely to have been exposed to heat or when its starting to degrade however the unfortunate reality is that most water. According to Arrowhead a leading bottler of Spring water their bottles have a 2 year shelf life and the best before date recommended for best taste is. Why Does My Water Have An Expiration Date Water Way The major concern with bottled water would be leaching which is when chemicals from the plastic of the bottle mix into the water. Water expiration dates . While water wont go bad on its own your water supply can still become contaminated over time depending on how its packaged. Water bottles all have expiration dates. A 1987 NJ state law required all food products sold there to display an expiration date of two years or. While there is evidence that bottled water can leach potentially harmful chemicals into our water supplyif you store your water properly it can last for many y