Does Bottled Water Really Go Bad or Expire? Can water get expiry date? Are we so detached from nature or is it just.. 30ml Bacteriostatic Water for Injection, USP Westend Medical Westend Medical Supply Did you know water bottles have an expiry date? Even if you made the move to reusable bottle, you might have some plastic bottles stocked up in case of emergency? Unfortunately, Did you know water doesnt expire, but the bottle does? The expiration date on water bottles isnt about the water going bad, but the plastic affecting taste. Plastic leaches chemicals over time, Bacteriostatic Water Overview, Application & Uses Lesson Study.com