How much water do you need to live

It depends on your body weight.

Take your weight (in pounds) and divide that by 2.2.

Multiply that number depending on your age: If you're younger than 30, multiply by 40 ...

Divide that sum by 28.3.

Your total is how many ounces of water you should drink each day.

Answer: A normal person that is active needs three quarters of a gallon of water every day.

Explanation: I want to add on that this question is not that clear But i thought this might be what you are looking for also, a human can survive with out water for three days.