How much water one should drink per day?
There's no evidence for the oft-repeated assertion that people need at least eight glasses of water per day. The Institute of Medicine recommends that men consume the equivalent of about 125 ounces of water daily and that women consume about 91 ounces -- but that includes water intake from all foods and beverages. Most people get adequate hydration without "purposeful drinking" of fluids for hydration. According to the U.S. government's "Dietary Guidelines for Americans," "purposeful drinking" is only necessary for people "who are exposed to heat stress or who perform sustained vigorous activity."
For an average person, how much water intake is from the food?
Moisture in food accounts for about 20% of the average person's total daily water intake.