Prepping peel: Wash the pineapple peel with running water. Place the pineapple peel in a pitcher big enough to fit the water and the peel, add the water. Cover and leave on the kitchen counter overnight, you should see some tiny bubbles on the surface.
Fermenting: Refrigerate for 3 to 4 days, or until you notice bubbles stuck to the sides of the pitcher. It should smell fruity, and a bit vinegary, but should have no foul odor.
Serving: Strain and pour the liquid into another clean pitcher. Add sugar or sweetener to taste, Add ice, and frozen pineapple cubes (optional).
Video
Notes
For some extra fun, dice and freeze some pineapple cubes to add to the drink when it's time to serve. This is optional, and not part of the traditional recipe.You can repeat the process twice more with the same peel (just refilling with clean water and letting it ferment again in the fridge).