P.R.
I asked a nutritionist that same question a while back. She said that my daughter should get about 3 servings of dairy a day (doesn't all necessarily have to be milk), about 4 - 6 oz of juice (Juicy Juice has a new veggie/fruit juice that my kids seem to really enjoy) and as much water as she will drink. She never gave me a definite amount on the water, she just said to give her as much as she will drink.
Sincerely,
P.