In the quart size Ziploc bag add the first four ingredients, close the bag and mix well. In the gallon size Ziploc bag put some ice with a lot of salt. Put in the quart size Ziploc bag. Add more ice with more salt. Close the gallon size Ziploc bag. Shake the gallon size Ziploc bag with your hands for 3 minutes or until the ice cream is done.