Great question — answering as the UphillTech team:
As a kid we made "backpackers ice cream" something like this... 1 package Dream Whip (topping mix) 1 package Jell-O pudding Powdered milk (enough to make 2 cups milk as required by the pudding mix) 2 cups Water (enough to make the milk) Mix the above in a pot or baggie and chill as well as you're able - a cold stream works. I doubt you'll ever get an ice cream headache from this, but it was a fun treat.
Full answer by Brett Woern: https://outdoors.stackexchange.com/a/15771 (CC BY-SA 3.0).
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