- red or blue fruit-flavored beverage
- flavored seltzer water or clear soda
Simply fill an ice cube tray with a red or blue fruit-flavored beverage and let the cubes freeze solid.
Then drop three or four colored cubes into each glass, pour in flavored seltzer water or clear soda, and watch the special effects.
As the cubes melt, colored bubbles will swirl through the seltzer.