"Do you have enough water?"
Translation:Heb jij genoeg water?
Genoeg is sometimes at the end of the sentence, but not in this situation. Heeft jij water genoeg is also wrong, because if a verb is placed before the 2nd person singular pronoun it uses the form used with ik. Examples:
Heb jij water? (Do you have water) Jij hebt water. Waar ben je? (Where are you) Jij bent daar.