Although bottled water has an expiration date, it doesn't actually go bad. Why is there an expiration date on a product that doesn't go bad? This is because New Jersey requires all food and beverages, including water, to carry an expiration date on its packaging. It doesn't matter if you don't live in New Jersey...our water may carry an expiration date anyway to make it easier to standardize packaging. Some bottled water only carries its bottling date or a 'best by' date. These dates are helpful because the flavor of the water will change over time as it absorbs chemicals from its packaging.