The daily water intake a person needs can vary based on several factors, including age, sex, activity level, climate, and individual health conditions. However, a general guideline for daily water intake is often referred to as the 8x8 rule, which suggests drinking eight 8-ounce glasses of water a day, totaling about 2 liters or half a gallon.

Drinking enough water offers health benefits, however, drinking too much water, such as 3-4 liters of water, in a short period leads to water intoxication. For proper metabolism, a normal human body requires about two liters of water.