Place the ice and salt in the Gallon sized Ziplock Freezer bag. Set this in the sink.
Pour the milk, vanilla and sugar in the Quart sized Ziplock Freezer Bag and seal the bag. Make sure this bag is well sealed and there is very little air inside.
Place the quart sized bag into the gallon sized bag with ice and seal the larger bag.
Shake the bag for 5-10 minutes. You can wrap the bag in a towel if it gets too cold to handle. Don’t open the gallon bag until the process is finished. You can feel the ice cream harden through the bag.
Open both bags taking care to wipe off the quart bag of ice cream so salt doesn’t get into the ice cream.
Spoon the ice cream into a cup or bowl or eat it right out of the bag!!