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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.
Despite their relatively small size, our kidneys play a very large part in enabling our bodies to function properly. Their job is to regulate the balance of water and minerals in our blood stream. One of the ways that the kidneys accomplish this task is through controlling our blood pressure. The kidney controls blood pressure by expelling surplus sodium from our bodies. If the kidneys are not functioning properly and not enough sodium is excreted, blood pressure will rise.