Does water go bad over time? Water doesn't contain sugars or proteins, so microbes don't consume and rot it, Discovery's DNews explains in a new video. ... When water is exposed to air, it absorbs CO2. A small portion of that (a little more than 0.1 percent) is converted into carbonic acid.

How does water go old?

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. Though these types of water may have an off taste, they're still generally considered safe to drink for up to 6 months.

Does water taste old?

Stale? And it's true. Scientists have found that water does indeed taste stale after being left out for a night and there are two chemical reasons behind the odd flavor.