"You have water."
Translation:Jullie hebben water.
To the best of my knowledge, "Drinken" is a regular verb, where the verb conjugation for hij/zij and jij are the same (stem + t). On the other hand, "Heben" is an irregular verb, so the conjugation for hij/zij is different from jij. "Zijn" is also an irregular verb.
In the Tips & Notes section of the "Present" lesson (with picture of man running), they explain all the conjugations of regular verbs.