Water helps your body:To maintain a normal temperature.Lubricate and cushion joints.Protect your spinal cord and other sensitive tissues.Get rid of wastes through urination, perspiration, and bowel movements.Your body needs more water when you are:During hot climates if not sufficient it may leads to dehydration which will cause other problems.More physically active requires water to balance water loss and also acid base balance.Certain condition like fever, or having diarrhea or vomiting.