[header] How to make flash freeze liquid [title] Gather your materials. [step] This substitute is made by combining dry ice and ethanol. For our purposes we will use 99% isopropyl alcohol or rubbing alcohol. 
You will also need a plastic 2-liter bottle, a plastic 18 oz bottle, dry ice, and scissors. [substeps] Dry ice pellets are easier to use than a block of dry ice.