On the Mythbuster's show they tried numerous things. I think the myth(?) was using compressed air. They tried a fire extinquisher and some other fancy stuff. I usually dunk it in ice water for a few minutes. They did that, which came in second by a minute or two compared to SALTY ice water - which has a cooler temperature.
I can't remember how good a job the extinqisher did. But it sure was messy!
Most packaged ice is kept at a temperature considerably below 32 degrees as does the freezer in your refrigerator; when salt is added to the ice, it melts this very cold ice and brings the temperature of the brine down to about 10-12 degrees.
Adding ordinary water to ice brings the brine down to 32 degrees and no colder.
Salt, water, ice-not always available.
Several liquified gases were, just don't turn 'em loose indoors!