Here’s the weird part. Water has an expiration date. I know, it’s just H2O, right? Wrong. That plastic jug isn’t forever.
Most jugs have a date printed on them. It’s usually two years from bottling. The water itself doesn’t spoil, but the plastic can leach a funny taste over time. It starts tasting like a forgotten Tupperware party.
Also, if you open it and drink straight from the jug (please don’t), you introduce bacteria. That jug becomes a science experiment. Gross. Use a glass.