Thanks for the tips. I really just want to buy a box of something this time. It is what the teacher requested. And I would like to find one to buy for our family anyway, although I may go the instant clear gel route, too.
Today I went to Jewel and Family Fruit Market, both near Six Corners. I got Dr. Oetker's chocolate mousse but I am going to keep looking. The mousse seems to require a mixer and the teacher prefers them to mix by hand. And I still don't have vanilla.
Next stops: A&G, Mariano's, Butera, Fresh Market, various Polish delis and fruit markets around here. It probably doesn't exist but I hate to leave stones unturned.
Whole Foods did not have what I wanted. One you had to cook, another was for use with tofu. Trader Joe's used to carry exactly what I want, but alas no more! Maybe I will check freecyle for that.