Once opened, bottled water can maintain its quality for four to six days if continuously refrigerated.
Understanding Bottled Water Shelf Life After Opening
While unopened bottled water can last indefinitely (though best by dates are common), its shelf life significantly shortens once the seal is broken. According to the shelf-life experts at Still Tasty, a bottle of water that is continuously refrigerated after opening can maintain its quality for four to six days. This recommendation specifically applies to water stored in a cool environment like a refrigerator, which helps to slow down the growth of bacteria.
Why Refrigeration Matters for Opened Water
The primary reason bottled water doesn't last long once opened is bacterial growth. When you open a bottle, it's exposed to air, which contains microorganisms. If you drink directly from the bottle, bacteria from your mouth can transfer into the water, multiplying over time, especially at room temperature. Refrigeration slows down this bacterial proliferation, extending the water's freshness.
- Minimizing Contamination: To further prolong quality, avoid drinking directly from the bottle repeatedly if you plan to keep it for several days. Instead, pour the water into a clean glass or cup.
- Proper Storage: Always re-cap the bottle tightly after each use to prevent airborne contaminants from entering.
- Temperature is Key: Storing opened water at room temperature or in a warm environment will accelerate bacterial growth, making it unsafe to drink much sooner than the refrigerated timeline.
Opened Bottled Water Shelf Life at a Glance
| Storage Condition | Approximate Duration After Opening | Notes |
|---|---|---|
| Continuously Refrigerated | 4 to 6 days | Recommended for maintaining quality and safety. |
| Room Temperature | 1 to 2 days (or less) | Risk of bacterial growth increases significantly. |
Signs Your Opened Bottled Water Has Gone Bad
While water doesn't "spoil" in the same way food does, bacterial contamination can make it unsafe or unpleasant. Look out for these signs:
- Unusual Taste: If the water tastes off, stale, or strangely metallic, it's best to discard it.
- Odd Smell: Any sour, musty, or unpleasant odor indicates potential bacterial growth.
- Cloudiness or Particles: Visible cloudiness, floaters, or sediment means the water is contaminated and should not be consumed.
