Whisk together the coconut water and cream of coconut in a mixing bowl until combined. Pour the mixture into ice cube trays, then freeze for at least 12 hours, or until frozen. (Cream of coconut does not always freeze completely, so if yours are not 100% solid, that’s ok.) Keep frozen until ready to use.

Run a lime wedge around the top of each glass until it the top 1/4-inch or so is moistened. Dip the glass in a bowl that has been filled with either shredded coconut and/or coarse rim salt. Chill the glasses in the freezer for at least 5 minutes before filling with the margarita mixture.

If your coconut is not sticking, you may need to pulse it a few times in a food processor until it is the consistency of coarse salt.

Add all ingredients (including the coconut ice cubes) to a blender and pulse until combined. Taste the mixture, and add simple syrup to sweeten if needed. You can also add extra ice cubes (either regular, or more coconut ice cubes) to thicken the consistency, if needed

Pour into prepared glasses and serve immediately, garnished with an extra lime wedge on top if desired.