I think I may have invented "White Trash Gelato."
Pour a package of sugar-free or regular Jell-O and a package of Vitamin C powder (like Emer-Gen-C) into a zip-top freezer bag. shake to combine. Add a cup of hot water and knead to combine. Add a cup of cold water and knead to combine. Try to get any excess air out of the bag. Zip the bag and place in another zip-top bag. Place in freezer. Check every hour and knead to distribute any ice crystals. Scoop into cups or bowls.