Exactly... If you drink 8oz of water, and your kidneys got rid of 4oz, it's because you didn't need those 4oz (or because your kidneys needed to use that water

Exactly... If you drink 8oz of water, and your kidneys got rid of 4oz, it's because you didn't need those 4oz (or because your kidneys needed to use that water to carry other stuff away with it).