"पानी कौन नहीं पीता?"

Translation: Who does not drink water?

[holdredial]

"Who is not drinking water?" was marked wrong. Is it?

[RanzoG]

It's wrong according to what Duolingo is trying to do. They are trying to make sure you recognize and acknowledge the difference between habitual ("I drink") and in-progress ("I am drinking"). In other words, they want you to match habitual in Hindi with habitual in English, etc.
(In the real world, it's possible to translate habitual in Hindi as progressive in English, like you did. But doing so will not demonstrate, in a Duolingo lesson, that you understand the grammar.)

[trj820]

Is the word order changed for questions to OSV?

[RanzoG]

The question word generally comes before the verb phrase.

[Carissa789117]

The French, or at least, water can't hydrate you in France...apparently.

[avxcadxs]

lmao... wine hydrates them. Ps. No offence.

[VerifiedByGod]

Ah yes. Although...
I had a friend whose learning Ukrainian, and they had to translate "My uncle does not like water" at least a few times. Maybe Duolingo's version Ukrainian uncle's don't drink water?

[Toby193004]

Why not "कौन पानी नहीं पीता"?

[UrwaShoaib]

I feel like both should be correct? I would personally use this phrase when speaking

[StephanieA26]

Why is there no है?

[StephanieA26]

Oh I see, because of the negation.

[Hema179384]

Why not who does not drinks water

[Misha614207]

Is the default for the verb male? Why not plural?

[RanzoG]

Yes, if it is a general, abstract question.

For plural, the english question would be like "Who all doesn't drink water?" and in Hindi you could repeat "kaun". i.e "...kaun kaun nahin pita?"

[revMa1]

The program is wrong.