Sugar free kool aid ingredients are
Malic Acid, Maltodextrin, Citric Acid, Calcium Phosphate, Aspartame+, Salt, Acesulfame Potassium, Contains less than 2% of Artificial Flavor, Ascorbic Acid (Vitamin C), and dyes to make it whatever color the 'flavor' is
Sugar Free Jello ingredients are
Gelatin, Adipic Acid (for Tartness), Disodium Phosphate (Controls Acidity), Maltodextrin (from Corn), Fumaric Acid (for Tartness), Aspartame (Phenylketonurics: Contains Phenylalanine.) (Sweetener), Contains Less than 2% of Artificial Flavor, Acesulfame Potassium (Sweetener), Salt, and dyes
A lot depends on what phase you are in. If it's P2 I would say no because of the Aspartame and Maltodextrin in both. I have heard of some (not necessarily in this forum) using unsweetened kool aid and sweetening with P2 protocol sweeteners but the unsweetened does contain cornstarch which I believe is not on protocol for P2.