Pour out 1 cup of tequila from the bottle and save for later use.
To the remaining tequila in the bottle, add lime juice, triple sec, and cream of coconut.
If any room remains at the top of the bottle, you can add more coconut if desired.
Place top on bottle and tilt several times to incorporate the ingredients.
Place bottle in freezer for at least 8 hours.
To serve, fill a cup with ice.
Add 3 ounces of coconut margarita mix and top with sparkling water.
Stir and serve with a lime wedge.
