Yes, you could drink 20-year-old bottled water, but it's generally not recommended. While properly sealed and stored bottled water has an indefinite shelf life and won't spoil, [several sources](https://www.reddit.com/r/askscience/comments/12c7841/does_properly_stored_water_ever_expire/, https://www.quora.com/Should-you-toss-expired-bottled-water-or-keep-them-for-emergency-anyway-since-they-are-still-drinkable, https://www.businessinsider.com/does-bottled-water-go-bad-yes-but-it-probably-wont-harm-you-2023-3) caution against this practice.
Factors Affecting Drinkability:
- Proper Storage: The key is proper storage. If the bottle has been kept sealed and protected from contaminants, the water itself remains safe to drink indefinitely. However, the plastic bottle itself might degrade over two decades, potentially leaching chemicals into the water.
- Container Integrity: Examine the bottle carefully. Any visible damage, cracks, or bulging could indicate compromised integrity and potential contamination. Even a seemingly intact bottle might have microscopic leaks.
- Emergency Situations: In a true survival scenario where no other water source exists, drinking old bottled water is a viable option. This does not negate the risks involved, but it weighs them against potentially fatal dehydration.
Recommendations:
- Seek Alternatives: If possible, always choose fresh, potable water.
- Inspect Before Consumption: Thoroughly inspect any older bottled water for signs of damage or discoloration before consuming.
- Err on the Side of Caution: While the water may be safe, it's wiser to avoid it if alternatives are available.
In summary: While the water itself won't spoil, the container's integrity and potential chemical leaching are serious concerns when considering 20-year-old bottled water. Only consume in an absolute emergency.
