Mix agua fresca and sugar. Depending on your preference you can do any of the following:
Fill up the trays with the agua fresca. After freezing, sprinkle the chile-lime seasoning on top before serving.
Mix chile-lime seasoning and agua fresca together before freezing and fill the trays.
A combination of both. Mix 2 teaspoons of chile-lime seasoning and 2 cups of lime agua fresca, fill up one tray. Then, fill up the second tray with just the agua fresca and sprinkle chile-lime seasoning at the end.
Freeze for at least 3 hours or until firm. Overnight is better.
Place the ice cubes in a food processor and pulse 3-4 times or until the cubes break up. Sprinkle the granita that did not have seasoning with chile-lime seasoning. Serve immediately.