Add sweetened condensed milk and stir until combined.
Pour into ice cream maker and churn according to the directions, about 30 minutes.
Scoop into storage containers and freeze for at least 3 hours.
Notes
Have fun experimenting with different flavors of soda.If you don't have an ice cream maker, you can make this like you would a granita. Pour it into a large container and put it in the freezer. Break it up with a fork every half hour or so until it is completely frozen, then just store it in the freezer until you are ready to enjoy it.