Water is good for the Kidney

Body fluids transport waste products in and out of cells. The main toxin in the body is blood urea nitrogen‎, a water-soluble waste that is able to pass through the kidneys to be excreted in the urine, explains Guest. "Your kidneys do an amazing job of cleansing and ridding your body of toxins as long as your intake of fluids is adequate," he says.

When you're getting enough fluids, urine flows freely, is light in colour and free of odour. When your body is not getting enough fluids, urine concentration, colour, and odour increases because the kidneys trap extra fluid for bodily functions.‎