There are 33.814 fluid ounces in one liter of water. A fluid ounce is an imperial measurement, whereas a liter is a metric measurement of liquids. A liter of water weighs one kilogram.
According to the Mayo Clinic, the Institute of Medicine recommends that an average adult male should consume 3 liters, which is roughly 13 cups or 101 fluid ounces of water, per day, while an average adult female requires approximately 2.2 liters, which is roughly equal to 9 cups or 74 fluid ounces of water, daily. Although the actual amount of water required varies with age, weight, health and local climate, these figures are the generally accepted guidelines for water intake.