"Das Wasser ist nicht tief."

Translation: The water is not deep.

[Die.Fledermaus]

I wrote "That water is not deep" but it was marked wrong. What would that be in German?

[Max.Em]

Dieses Wasser. It is very unusual to use der/die/das as demonstrative pronouns in front of a noun, since they couldn't be distinguished from definite articles, at least in writing. In speaking they can be stressed ("Das Wasser"/"das Wasser").

[PraktikerP]

I wrote "This water is not deep " but it was marked wrong...why?

[Lars285454]

That would be "Dieses Wasser ist nicht tief".