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Best Answer: Well - the kidney is the organ that regulates the amount of water *leaving* your body. It is controlled by hormones from other parts of your body: the pituitary gland below the brain, the adrenal glands above the kidneys, the liver. Intake of water is done by drinking, and most of the water is absorbed in your large intestine. The state of being thirsty is hormonally controlled from the hypothalamus.
Kidneys adjust the body's acid/alkaline balance and regulate the amount of fluids in your body. Kidneys process 200 quarts of blood daily to filter out 2 quarts of excess water and wastes. The kidneys monitor the correct balance of sodium, potassium and phosphorous in the blood, along many other body chemicals. Excess minerals, hormones, water and other substances are passed to the bladder and out of the body. If your kidneys aren't able to remove waste products and excess minerals, these build up in the blood and cause damage. Kidneys also produce several essential hormones.