This recipe comes from Oggi:
Watermelon Lambanog Cocktail Ice Candy
-a quarter of a watermelon, cubed
-2 tablespoons lime juice
-sugar, to taste
-lambanog or watermelon vodka, to taste
Puree watermelon in a blender. Place a strainer lined with a coffee filter over a measuring cup. Pour the pureed watermelon and leave for 20 minutes. Discard the pulp and coffee filter. Stir in lime juice and sugar and lambanog to taste. Fill bag one at a time, twist the top of the bag and make a knot to seal. Place filled bags in an upright position in a container if desired, otherwise lay them flat on a smooth surface, and let freeze for several hours.
Check out Oggi for more ice candy ideas.