Drinking enough water each day reduces the risk of cardiovascular disease. Our blood is made up of 90% water. Which means it must be constantly replenished. Water helps regulate a person's blood pressure. If you don't drink enough water your body will maintain a high blood pressure to make sure your organs receive enough. Drinking enough water is important for healthy kidney function. When we don't drink enough, the kidneys have to work harder and that puts stress on them.