Drinking water

We went for Rocco's 6 moth checkup. He's 21 lbs. 13 oz. and 29 inches long. Still a big boy! Especially on the height chart. The doctor said he can drink some water in a sippy cup now. He figured out the sippy cup but hates the water coming out of it. Now he'll only drink out of a water bottle! He's so funny, can't do anything the way most kids do it!