Water is generally safe to drink from a sealed bottle for an indefinite period, as long as it’s stored properly. However, factors like the type of bottle, storage conditions, and whether the seal is broken can affect its safety and taste over time.
How Long Can You Safely Drink Water From a Bottle?
The question of how long water remains safe to drink from a bottle is a common one, especially for those stocking up or wondering about bottled water they’ve had for a while. While bottled water doesn’t typically expire in the way perishable food does, its quality and safety can degrade under certain circumstances. Understanding these factors will help you make informed decisions about your hydration.
The Shelf Life of Bottled Water: What You Need to Know
Generally, unopened, commercially bottled water has a very long shelf life. Manufacturers often print an expiration or "best by" date, but this is usually related to the quality of the plastic bottle rather than the water itself. Over extended periods, chemicals from the plastic can leach into the water, affecting its taste and potentially its safety.
Factors Affecting Bottled Water Safety
Several elements play a role in determining how long bottled water remains optimal for drinking:
- Bottle Material: Plastic bottles, particularly those made from PET (polyethylene terephthalate), can degrade over time. This degradation can lead to the leaching of chemicals like antimony into the water. Glass bottles are a more stable option and do not pose this risk.
- Storage Conditions: Exposure to heat and sunlight significantly accelerates the degradation of plastic bottles and can promote bacterial growth if the seal is compromised. Storing bottles in a cool, dark place is crucial for maintaining water quality.
- Seal Integrity: A broken or compromised seal is the most significant factor that can render bottled water unsafe. Once the seal is broken, the water is exposed to airborne contaminants and bacteria, which can multiply rapidly.
Understanding Expiration Dates on Bottled Water
The expiration dates you see on bottled water are often a quality indicator, not a strict safety deadline. The U.S. Food and Drug Administration (FDA) does not require bottled water to have an expiration date. However, some states mandate them, and manufacturers may include them to ensure the best possible taste and quality.
If you find bottled water past its printed date, it’s generally safe to drink if the bottle is unopened and undamaged, and if it has been stored correctly. However, you might notice a slight change in taste due to the plastic.
Best Practices for Storing Bottled Water
To maximize the shelf life and safety of your bottled water, follow these storage guidelines:
- Keep it Cool: Store bottles in a temperature-controlled environment, away from direct sunlight and heat sources like ovens or car trunks.
- Store in Darkness: A pantry or cupboard is ideal. Light can degrade the plastic and affect the water.
- Check the Seal: Always inspect the bottle’s seal before drinking. If it appears tampered with or damaged, discard the water.
- Avoid Refilling Plastic Bottles: Refilling single-use plastic bottles can introduce bacteria and further degrade the plastic.
What Happens When Bottled Water Goes "Bad"?
While bottled water doesn’t typically harbor harmful bacteria in its original sealed state, issues can arise:
- Taste Degradation: As mentioned, chemicals can leach from the plastic, imparting an unpleasant, plastic-like taste.
- Bacterial Contamination: If the seal is broken or the bottle is refilled, bacteria can enter and multiply. This can lead to gastrointestinal issues if consumed.
- Chemical Leaching: Prolonged exposure to heat and light can increase the rate at which chemicals like BPA (though less common in modern PET bottles) or antimony migrate into the water.
When Should You Discard Bottled Water?
It’s best to err on the side of caution. Discard bottled water if:
- The seal is broken or appears tampered with.
- The water has a cloudy appearance.
- There is an unusual odor or taste.
- The bottle has been stored for an extended period in extreme heat or direct sunlight, even if unopened.
Comparing Storage Options for Water
| Feature | Sealed Plastic Bottle (PET) | Sealed Glass Bottle | Reusable Water Bottle (After Opening) |
|---|---|---|---|
| Shelf Life | Indefinite (quality degrades) | Indefinite | Days to weeks (depending on cleaning) |
| Taste Impact | Can be affected by plastic | Minimal | Can be affected by residue/bacteria |
| Chemical Risk | Low, but increases with heat | Negligible | Depends on bottle material & cleaning |
| Portability | High | Moderate | High |
| Best Use | Emergency supplies, short-term | Long-term storage | Daily hydration, frequent refilling |
Frequently Asked Questions About Bottled Water Safety
### Can you get sick from drinking old bottled water?
You are unlikely to get sick from drinking old, unopened bottled water if it has been stored properly. The main concern with older bottled water is a potential degradation in taste due to chemicals leaching from the plastic, especially if exposed to heat or light. However, if the seal is compromised or the water has been stored in poor conditions, bacterial contamination is possible, which could lead to illness.
### How long is bottled water good for after opening?
Once opened, bottled water should be consumed within a few days, ideally 2-3 days. This is because opening the bottle exposes the water to air and potential contaminants, allowing bacteria to grow. Always store opened bottled water in the refrigerator and check for any changes in smell or appearance before drinking.
### Does bottled water expire if left in a hot car?
Yes, bottled water left in a hot car for an extended period can degrade in quality and potentially become unsafe. High temperatures accelerate the leaching of chemicals from the plastic into the water, affecting its taste and potentially its safety. Furthermore, heat can encourage bacterial growth if the seal has been compromised. It’s best to avoid consuming water that has been repeatedly exposed to high heat.
### Is it safe to drink water from a bottle that has been frozen?
Drinking water from a bottle that has been frozen is generally safe, provided the bottle was not overfilled and did not burst. Freezing can sometimes cause plastic bottles to crack or leach more chemicals. If the bottle remains intact and the seal was not broken, the water itself should be safe. However, the plastic may have been compromised, so it’s advisable to transfer the water to a clean container if possible and consume it relatively soon.
### What is the best way to store bottled water for emergencies?
For emergency preparedness, store bottled water in a cool, dark, and dry place. Aim for a consistent temperature