..as if you need any more replies to help you decide......I also tried using the red Kool-Aid. Wrong!!! The flavors are soooooooo intense that it almost makes your eyes water! Just thought I'd share that with ya!!
I personally havent tried this, but I know a girl who did. She used the already sweetened koolaid and I dont know how much she added, but it was ok! But I think it interferred with the taste of the cake and icing. Of course I couldnt bring myself to telling her that!. The color came out a light lilac, it was pretty, not gritty, but the taste conflicted I think.