OK...I have heavy whipping cream in the fridge. Do I whip up a little as I plan on using it or whip the whole carton (pint) at one time? Does is keep well in the fridge already whipped up? Also...do you add splenda or something to it or is it good all by itself as a topping (like for Jell-O)? I've never used the real thing...always bought Cool Whip.

Tricia