S.H.
Water intake and what is appropriate or too much... really depends on the child's weight/activity/body temperature etc. and how much water is fine or not...for a given individual....
The rule of thumb for a child, is to drink no more than half or 1/3 their body weight.
In some cases, water intoxication can happen.
Don't give juices. Juices are not as healthy as the fruit itself.
Is he getting calcium from any other food source? Or milk-fats from any other food source? Milk-fats.. is an essential nutrient for brain development... in toddlers.
all the best,
Susan