Is it correct to say "don't drink old water, drink new one"?

Question

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?

and

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?

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”.