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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.
In diseased states, where body water is affected, the compartment or compartments that have changed can give clues to the nature of the problem, or problems. Body water is regulated by hormones, including anti-diuretic hormone (ADH), aldosterone and atrial natriuretic peptide. In Netter's Atlas of Human Physiology, body water is broken down into the following compartments: 1  Intracellular fluid (2/3 of body water).