Pour root beer soda into a measuring cup.
Stir gently and often to release bubbles.
Continue for about 4-5 minutes.
Stop when bubbles are less frequent.
Taste the root beer; it should be flatter.
Add the dry Dream Whip mix and whisk well.
Transfer the mixture to a Ninja Creami pint container.
Loosely place the lid on top.
Leave the lid slightly open for gas release.
Freeze for at least 24 hours.
Remove the pint container from the freezer.
Take off the lid and set aside.
Place the container into the Ninja Creami's outer bowl.
Lock the outer bowl lid into place.
Insert the bowl into the Ninja Creami machine.
Press the Lite Ice Cream button.
Allow the cycle to complete.
If ice cream is crumbly, press the Re-spin button.
If it’s still crumbly, add a tablespoon of water.
Re-spin the mixture again.