Water helps our body perform necessary functions like maintaining a healthy temperature, lubricating our joints, flushing waste from our body and, ultimately, keeping us from becoming dehydrated, which can cause muscle aches, headaches and lack of energy. “Water is so essential [to] many bodily functions and makes up about 60% of our body’s composition,” said Ashleigh Stewart, a clinical nutritionist and owner of The Wellness Refinery in Philadelphia. “We lose our water content all day long through sweating, exercise and elimination, so replenishing water stores in our body is one of the kindest things we can do for our health.”