King Coconut water is a natural, fat-free drink. Low in sugars and calories, it is rich in essential electrolytes and vitamins. Once you choose up a fresh coconut and shake it, the fluid you hear sloshing around inside is the coconut water. Young coconuts contain the most coconut water, and as they mature, this water thickens and absorbs into the meat of the coconut. Some people cook with coconut water, though most enjoyed it as a soothing drink or as a healthy base for a smoothie.