you can live for up to 30 days without food. But only 3 days without water. Water is the essence of life. when you are not drinking enough water, your body interprets that as a stress and releases stress hormones. We all know what too much Cortisol can do to the body. Aim for half of your bodyweight in ounces per day. I weight 240 pounds so I get a minimum of 120 ounces of water per day. Your skin will thank you, your body will thank you and you will more easily lose fat.