How much should your daily water intake be? Is the 8 X 8 recommendation justified? According to the Guyton’s Textbook of Medical Physiology, this is how much water we lose every day under normal conditions:

Skin (not from sweat)–12 ounces
Lungs–12 ounces
Sweat–4 ounces (without exercise)
Feces–4 ounces
Urine–48 ounces

Total: [...]

“How much water should I drink each day?”
A question many people don’t have a clue to. You have probably heard the phrase “eight 8 ounces a day”, but your water need depends on many factors including your health, your weight, your lifestyle, how active you are and the climate where you live.
As a general rules, [...]