An average adult body is 50 to 65 percent water -- that's roughly 45 quarts. Men are more watery than women. A man's body is 60 to 65 percent water, compared to 50 to 60 percent for a woman. In infants, the figure is a whopping 70 percent.

Water content differs throughout the body. Blood is made up of 83 percent water, bones are 22 percent water, and muscle is 75 percent water.

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Within single cells water content ranges between 70 and 85%. The percent water in the entire body by weight varies with age, sex, and physical conditioning. Heart and lung contain the most water, about 80%. Fat (about 20%) and bone (about 43%) are among the lowest. Therefore, the total body is an average of all organs, blood, and extracellular fluids.