Dry gas is that gas with no 10 % ethenol in it, or high test gas 94 oct.
No. It's isopropanol. Auto parts store. But buy one that says isopropanol on the label. Not the cheap stuff. But that won't prevent carb icing. That will just prevent gas line freeze ups and disperses water in the fuel. Carb icing is humidity freezing up in the venturi of the carb.