Question

water does not become stale or fresh​

Answer 1

Answer:

Answer: But that's not what makes old water taste stale. ... After about 12 hours tap water starts to go flat as carbon dioxide in the air starts to mix with the water in the glass, lowering its pH and giving it an off taste. But it's most-likely safe to drink.

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Answer 2

Answer:

Tap water can be stored and consumed for up to 6 months with minimal risk of adverse side effects as long as it has been stored properly ( 1 , 2, 3). ... Regular water can also develop a stale taste over time, which is caused by carbon dioxide in the air mixing with the water and making it slightly more acidic.