You can dye Easter eggs with Kool-Aid. Yes you can and I'm going to give this a try next week. The instructions are at the link, but basically you use one pack of Kool-Aid to 2/3's cup of water. No need to boil water or add vinegar.
Be advised though that while some people had no problems with thisl others had a hard time getting much color and others had to leave the eggs in the mixture for a long time. I may do a test run.