Fluid requirements vary among individuals based on age, sex, activity level, and even where you live,. Your personal fluid requirements also can vary each day, depending on the other things you're doing, eating, and drinking.
The health authorities commonly recommend eight 8-ounce glasses, which equals about 2 liters, or half a gallon.
Hey! You can improve and maintain good health of an elementary school age child by making sure they get regular enjoyable exercise, have proper healthy balanced meals, and that they are learning and interacting with others their own age well. I wish you all good health and positive energy! :) - Aspen