Instructions on making ice cream

Add 1/4 cup sugar, 1/2 cup milk, 1/2 cup whipping cream, and 1/4 teaspoon vanilla to the quart ziplocTM bag. Seal the bag securely.
Put 2 cups of ice into the gallon ziplocTM bag.
Use a thermometer to measure and record the temperature of the ice in the gallon bag.
Add 1/2 to 3/4 cup salt (sodium chloride) to the bag of ice.