You can generally drink 20-day-old water if it has been stored properly in a clean, sealed container, as the primary risk comes from contamination. However, the taste and quality may degrade over time, and it’s always best to err on the side of caution with stored water.
Is It Safe to Drink Water That’s 20 Days Old?
The question of whether it’s safe to drink water that’s been sitting for 20 days is a common one, especially for those stocking emergency supplies or simply wondering about water left in a bottle. The short answer is that properly stored water is generally safe, but several factors influence its drinkability. The key concern is microbial contamination.
Understanding Water Storage and Safety
Water itself doesn’t "spoil" in the way food does. The primary danger comes from external contaminants that can enter the water. If water is stored in a clean, sealed container, it can remain safe to drink for extended periods. However, if the container is opened frequently or not properly sealed, bacteria and other microorganisms can enter.
Factors Affecting Water Safety:
- Container Type: Use food-grade, BPA-free plastic or glass containers. Avoid containers that previously held non-food items.
- Seal Quality: Ensure the container is tightly sealed to prevent airborne contaminants from entering.
- Storage Environment: Store water in a cool, dark place, away from direct sunlight and chemicals. Sunlight can promote algae growth, and heat can degrade plastic.
- Initial Water Quality: Start with clean, potable water. Storing already contaminated water will not make it safe.
Potential Risks of Drinking Old Water
While the water itself might not be inherently dangerous after 20 days, the risks increase if it hasn’t been stored correctly. Bacterial growth is the main concern. If bacteria enter the water, they can multiply, especially in warmer temperatures.
Drinking water contaminated with bacteria can lead to various waterborne illnesses, such as:
- Gastrointestinal issues (diarrhea, vomiting)
- Fever
- Abdominal cramps
The longer water sits, and the more opportunities for contamination exist, the higher the risk. This is why emergency preparedness guidelines often recommend replacing stored water every 6 to 12 months.
How to Tell if Your Stored Water is Still Good
Even if stored properly, it’s wise to check your water before drinking it. Trust your senses.
Signs your water might not be safe:
- Cloudiness: If the water appears cloudy or murky, it indicates the presence of particles or microbial growth.
- Unpleasant Odor: A musty, metallic, or generally off-putting smell is a strong indicator of contamination.
- Strange Taste: Any taste that isn’t fresh and clean is a warning sign.
If you notice any of these signs, it’s best to discard the water and use a fresh source.
Best Practices for Storing Water
To ensure your stored water remains safe and palatable for as long as possible, follow these guidelines:
- Use Clean Containers: Always start with thoroughly cleaned, food-grade containers.
- Fill Completely: Fill containers to the brim to minimize air space, which can harbor contaminants.
- Seal Tightly: Secure the lids tightly to prevent anything from entering.
- Store Appropriately: Keep containers in a cool, dark, and dry location.
- Label and Date: Mark containers with the date they were filled.
- Rotate Regularly: Replace stored water every 6-12 months to ensure freshness and safety.
What About Bottled Water?
Commercially bottled water typically has a long shelf life due to the sterile bottling process and the quality of the containers. However, even bottled water can degrade in quality over time, especially if stored improperly. Look for the expiration date on the bottle, though this often refers to the container’s integrity rather than the water’s safety.
Key points for bottled water:
- Storage Matters: Avoid storing bottled water in hot cars or direct sunlight.
- Container Integrity: Check for any damage to the bottle or seal.
- Taste Changes: While safe, the taste might change after prolonged storage.
Can You "Freshen Up" Old Water?
If your water is 20 days old and you’re unsure about its quality but don’t want to discard it, you can try to disinfect it.
Methods to disinfect stored water:
- Boiling: Bring water to a rolling boil for at least one minute. This kills most harmful microorganisms. Let it cool before drinking.
- Chemical Treatment: Use unscented household bleach (5-6% sodium hypochlorite) or water purification tablets according to their instructions. For bleach, use 2 drops per quart of water, mix well, and let stand for 30 minutes.
These methods can make questionable water safer, but they won’t remove chemical contaminants or improve taste.
Frequently Asked Questions About Stored Water
### How long is water really good for in a plastic bottle?
Water in a plastic bottle can remain safe to drink for a very long time if the bottle is sealed and stored properly. However, the plastic itself can degrade over time, potentially leaching chemicals into the water, and the seal can be compromised. It’s generally recommended to use bottled water within a year or two for optimal taste and safety, and to avoid storing it in hot environments.
### What happens if you drink old water?
If you drink old water that has become contaminated, you risk developing waterborne illnesses. Symptoms can include nausea, vomiting, diarrhea, abdominal cramps, and fever. The severity depends on the type and amount of contaminants present in the water.
### Does water expire if you don’t open it?
Unopened, commercially bottled water doesn’t technically "expire" in terms of safety for a very long time, as long as the seal remains intact and the bottle is stored correctly. However, the plastic bottle can degrade, affecting taste and potentially leaching chemicals. Many manufacturers recommend consuming it within a couple of years for the best quality.
### What is the best way to store water long-term?
The best way to store water long-term is in food-grade, BPA-free plastic containers or glass carboys. Fill them completely to minimize air, seal them tightly, and store them in a cool, dark, and dry location. Regularly rotating your stored water supply (every 6-12 months) is crucial for maintaining its freshness and safety.
### Can 20-day-old water from a tap be drunk?
If the water is from a tap and has been sitting in a clean, sealed container for 20 days, it is likely still safe to drink, assuming your tap water is safe. However, the taste may have changed due to the absence of chlorine, which dissipates