Original Source: Dori Byron, Michigan
I have made this very successfully at an outdoor camp (a visitor brought in the ice) and with my Pippin aged 5+6
1/2 cup milk (it doesn't matter what kind, whole, 2%, chocolate, etc.
1 Tablespoon sugar
1/4 teaspoon vanilla (you might try other flavourings)
1.Add these to a medium size zip lock freezer bag and zip shut.
2.Place that bag in a larger zip lock bag
3.Add ice to fill bag 1/2 way, 6 Tablespoons salt (rock or regular)
4.Zip that one shut and shake, turn, toss, and mix the bag. In about 5-10 minutes you will have cold hands and yummy ice cream.
Don't double this it doesn't seem to work.
Be sure you get all the salt off the small bag before you open it.