Source: Recipe by Joshb

2 packets unsweetened Kool-Aid packets (any flavor - I like cherry)
1/2 cup Splenda
1 tablespoon Sweet 10 (or another 1/2 cup Splenda)
4 packets unflavored unsweetened gelatin
4 cups water

This can be made with a full cup of Splenda, or to cut the carbs in half, half cup Splenda and a tablespoon of sweet 10.

Place Kool-Aid, Splenda, Sweet 10, and gelatin in a bowl. Add 3 cups of boiling water. Mix, mix, mix, mix! Make sure there are no little chunks of anything in it at all. Now pour the mixture into a flat 8 1/2 x 11-inch baking dish. Add 1 cup cold water, and refrigerate until it has a nice, Jell-O consistency. There you go! In my opinion, tastes much better than diet Jell-O, and is Aspartame free!

With a full cup of Splenda, carb count would be 24. With Splenda and Sweet 10, carb count would be 12.