Best Answer: The digestive tract and the urinary systems are principally the important players in maintaining water and electrolyte balance within the body. We take water in by mouth in food and drink, along with electrolytes. We excrete water through urine and feces. Also, a significant amount of water is lost through insensible losses by sweating and breathing. While sweating and breathing do shed water, it's the kidneys that are most responsible for ridding the body of water.