Question: is it healthy to drink a gallon of water in 8 hours?
Answer: Many people follow the 8x8 rule, which recommends drinking eight 8-ounce (237-ml) glasses, or about half a gallon (1.9 liters), of water daily. However, many believe there are strong health benefits to be gained by increasing your water intake to a full gallon (3.8 liters) per day.