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Approximately 80% of our water intake comes from drinking water and other beverages, and the other 20% comes from food. Assuming these percentages are accurate for most of us, the recommended amount of beverages, including water, would be approximately 9 cups for women and 12.5 cups for men. While 20% may seem like a lot of fluid to get from food, many common food items are mostly water.
The percentage of water in infants is much higher, typically around 75-78% water, dropping to 65% by one year of age. 1  Body composition varies according to gender and fitness level because fatty tissue contains less water than lean tissue. The average adult male is about 60% water.