Add coconut flesh, coconut water and 1 cup water to the jar of your blender
Process on the highest possible speed for 5 to 10 minutes; you really want to get the most out of that coconut flesh as you possibly can. You'll notice, as the flesh spins around, that it will get looser and looser and will spin more freely after a while. You want to be able to see some liquid in there. A good amount of liquid!
When you feel your coconut has given all it had to give, transfer the contents of your blender to a fine mesh sieve that's been lined with cheesecloth.
Add another half cup of plain water to the jar of your blender and give it a quick spin just to get every last bit that was left behind. Add that to the rest of the fragrant pile of coconut.
Now squeeze the bejesus out of your coconut. And I do mean the bejesus. Squeeze until can’t get another drop out. You will be left with a bunch of dry, VERY dry, and pretty bland and tasteless, shredded coconut. You could discard this, unless you can think of a way to use it…
Transfer your beautiful coconut milk to an airtight glass jar or container and keep refrigerated for up to 5 days.
Homemade Coconut Milk from Fresh Coconut https://thehealthyfoodie.com/homemade-coconut-milk/