A few weeks ago we made some flavored ice cubes. My son started out with a few different flavors of Kool Aid and added sugar to make it sweet. He poured the different flavored Kool Aid into ice cube trays and abracadabra flavored ice. We added it to seltzer and water to create delicious, pretty drinks with much less sugar than soda or a full cup of Kool Aid. The kids loved adding a variety of flavors to create their own "specialty drinks".
We also landed up making flavored ice cubes with straight lemon juice and lime juice. These were also delicious to create a refreshing lemon and/or lime drink with no sugar.
If you ask my son, he had the most fun mixing up all the different colors of Kool Aid into one pitcher - see the resulting brown Kool Aid?