I f you have access to a kosher market you will be able to find there a
frozen product that is pareve (no milk or meat). It is thawed and then
whipped up just like whipped cream. sorry I don't know the name of it.
I t somes in a blue and white container, just like a small milk
carton. i t would also be worth checking in a large supermarket for
this. It is not healthy and it has a metallic aftertaste just like tha
canned stuff but it does the trick. You also may be able to find
pareve cannned whipped topping at the kosher supermarkets or at a
regular supermarket. Safeway here( Wash D.C, area) carries a canned
product that would be safe.
Good luck,
Larissa