That depends how much they drink and eat.
None!!
8 glassess
drink a gallon or more of water a day.
How much milk you should drink daily depends on your sex and age. It is recommended you drink 3 to 5 glasses a day.
2-3 bottles
1 cup
3 to 4 liters of water
2 quarts a day.
As much as you can! The more the better
around 5% of your body weight
It more depends on the weight for how much water they should drink. So take their weight, divide it by 2, and that's roughly how many ounces of water they should drink daily. (Example) 100 pounds divided by 2 equals 50 ounces. In this case