This is an article "Old water contains bacteria, but it's generally yours", which could be written by native speakers

Can we say "old water" to refer to water left overnight in an open container or in a close container but you put your mouth or your tongue in the water. In both cases, bacterium may spread the whole water?


Can we say "new water" to refer to water left overnight in a closed container and has not been infected from your mouth or tongue?

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    As far as I know, old water is not a standard phrase. The people quoted in the article explain what they mean by it. You can't say "Drink new one" in this context; you would have to say "Drink fresh water", "Use a new bottle", or "Replace it with fresh [water]". (Of course, fresh water can also mean not seawater, but the meaning should be obvious from the context.) Commented Apr 6, 2021 at 7:48

1 Answer 1


The word “old” wouldn’t normally be used in this kind of context. The more specific English word that is used to describe a food or drink that may have had its edibility or potability compromised by the passage of time is “stale”.

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    And the antonym of stale is "fresh".
    – James K
    Commented Apr 6, 2021 at 11:22

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