1. Mix 1/4 cup sugar and 1-1/2 cups water to 1 colour drink mix in 2-cup liquid measuring cup or small bowl; pour into ice cube tray. Repeat with remaining drink mix colours, 1 at a time, and using additional ice cube trays as needed.
2. Freeze several hours or until solid.
3. Add ice cubes to large glasses just before serving. Fill with soda.