According to the Institute of Medicine, an adequate intake for men is roughly 13 cups of total beverages a day, while for women the number is about 9 cups a day.
If you prefer to count glasses instead of cups, an 8-ounce glass holds the same amount of liquid as a cup.
“Every day you lose water through your breath, perspiration, urine and bowel movements, according to the Mayo Clinic. “For your body to function properly, you must replenish its water supply by consuming beverages and foods that contain water.”
And contrary to what you may have heard in the past, “all fluids count toward the daily total.”