So, I make my own coconut milk and it separates after time once it cools. I've considered using the wonderful top layer in something instead of mixing it back in. What I want to know is what to do with the leftover water. Does it contain vitamins from the coconut? Is it worth saving and finding a use for?
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Coconut water seems to be very rich in minerals and electrolytes, specially potassium, that's why it has been using as endurance recovery sport drinks. Also rich in magnesium which is one of the most valued minerals over the Paleo community recently because of its multiple attributed health benefits.
If it's home made it seems pretty reasonable to want to keep it and drink it since its a by product of natural, healthy coconut, provided that it has been conserved in good conditions (home made is more natural but also easier to go rancid faster of get bad bacteria).
When in bad conditions coconut starts to smell funny so I guess you will know if it's in good condition or not.
I'd definitely go for it.
Some more detailed info at Nutrition Data. http://nutritiondata.self.com/facts/nut-and-seed-products/3115/2
Use the water in soups and stews, or when making bone broth. You can also just drink it.