Special equipment: 10 to 12 ice-pop sticks
Pour 1 cup of tequila in each of two 9-by-13-inch baking dishes. Add the watermelon slices and let soak for 10 minutes in the fridge, flipping halfway through.
Mix together the sugar, salt, chipotle powder and lime zest in a bowl.
Remove the watermelon from the tequila and put each piece on an ice-pop stick. Sprinkle a few pinches of the seasoning over the watermelon.