how long does bottled water last
Quick Scoop
Bottled water usually does not “go bad” quickly if it stays sealed and stored properly, but the package and storage conditions matter more than the water itself. A practical rule is: unopened bottled water can last for years , while opened bottled water is best used within a few days.
What affects shelf life
- Unopened bottles: If kept sealed in a cool, dark place , bottled water can remain safe for a long time; some sources say manufacturers use “best by” dates of about 12 to 18 months depending on the bottle type.
- Opened bottles: Once opened, the risk of contamination rises, and one source recommends finishing it within 4 to 6 days. Other guidance suggests opened water should be used even sooner if it sits at room temperature or is repeatedly sipped from.
- Heat and sunlight: Warm storage and direct sunlight can speed up plastic breakdown and affect taste or safety.
Simple rule of thumb
- Sealed and stored well: Safe for a long time, often past the printed date if conditions are good.
- Opened: Use quickly, ideally within a few days.
- Smells odd, tastes off, or the bottle is damaged: Replace it.
Best storage tips
- Keep it cool and dark.
- Keep it in the original sealed container.
- Avoid storing near cleaners, gasoline, or other chemicals.
- Rotate your supply if you keep water for emergencies.
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