If you want to have whipped cream I agree with tofi, RediWhip is made with sugar, you should make it yourself. But it doesn't have to be that hard. You should get yourself a whipped cream dispenser. They are sold all over the Internet. I have had good luck buying cream charges at creamright.com , or just do a google search for whipped cream charges. They also sell dispensers, though I've never used them for that.

They cost about $40 for the dispenser and about $10-12 for a box of 24 charges. Each charge makes one pint of cream. It's great because you can drop a pint of heavy cream in the dispenser with some Splenda. I sometimes put other flavors in it too. You can leave it in the refrigerator for 2-3 weeks and take small hits without having to drag out the mixer.

I use it with SF Jello and peanut butter too.

-Jim