Pure coconut water is an excellent source of potassium but doesn’t have any magnesium and only low amounts of sodium.  Plus, one serving (8 oz) of unsweetened coconut water has about 10 grams of carbs, including 7 grams of sugar.  The bottom line is that coconut water is a poor source of micronutrients and electrolytes, with the exception of potassium. I’d rather drink camel milk, which has the same amount of sugar but is loaded with micronutrients.