The human body is about is 70% water. Newborns are roughly 80% water, and elderly are as little as 50% water. Our muscles are about 75% water. Even our bones, which seem completely solid, are 25% water. Without food, we would eventually die, but without water, we would die a lot sooner. Depending on the amount of fat and muscle in our bodies, most of us can live several weeks without food, 5-7 weeks on average. The average person can only survive 5 days without water. Undoubtedly, water is life. [read]