Stir the cold water and sugar until the sugar is dissolved! This step is the most important, if your sugar isn’t dissolved it will stick to the dry ice in chunks.
Once it’s dissolved add the root beer extract and stir it in!
Crush the dry ice, we crushed it in a bag on our wood cutting board with a hammer.
Pour it into the root beer sugar water and stir to keep clumps of the dry ice from sticking to the bowl!
You can see it bubbling away here! keep stirring it until the dry ice has all dissolved.