We used that trick for a gelatin-type cheesecake, too. 2 packets of Knox instead of the aspartame-sweetened brand, 2 packets of Kool-Aid for flavoring and enough Splenda to sweeten it properly. I used a Kiwi-Lime flavor (that's no longer carried) because it's my favorite Kool-Aid flavor and I have saved some back from when they did produce it. It made a rather tart and creamy lime pie. I'm thinking of trying the black cherry flavor next.