Step 4) Once the bottle feels firm with air pressure, pop off the bike pump adaptor and PRESTO! The change from high to low pressure’s cooling effect creates a miniature cloud inside your 2-liter!

Cloud in a bottle. Pump a soft drink bottle full of air, pop the top and bam! A thick, ... Rotate and wiggle the bottle to swirl the alcohol around for 10 or 20 seconds to 'encourage' it to evaporate.