*But not just water. These fluids also contain electrolytes like sodium, potassium, and calcium, which are vital to many key functions in the body. Not only do they help send signals between neurotransmitters and enable muscle movement, these electrolytes also retain water and balance pH levels. When you don’t drink enough water or an electrolyte imbalance occurs, dehydration sets in. And because the human body is mostly water, even 2% dehydration diminishes physical and mental performance. So, be smarter than a watermelon and replenish your electrolytes so you can feel your best and get back to that to-do list.