Coconut water is known to be a good source of 5 key electrolytes � sodium, magnesium, calcium, potassium and phosphorus, which hydrate and nourish the body. Electrolytes replenish essential mineral salts that can be lost during daily activities, exercise and sweat and need to be replenished to maintain proper water amounts in your body; for muscle function and other important bodily processes. This is why coconut water has become the rehydration drink of choice for athletes looking to avoid the preservatives and artificial ingredients in sports drink.