My 17 month old hates drinking water alone. I try and add a lemon or some strawberries or blue berries just for him to look at and try to flavor it a little bit. But he hates it.  My pedi says I should cut juice out all together. That he doesn't need it but I take that as a suggestion. He gets apple juice cut with water for lunch. And prune juice cut with water to help him with constipation.