This is stupid. The salt lowers the freezing temperature of the water, but does nothing to transfer the cold to the can any faster. Regardless of the freezing temperature of the water, the water would never freeze anyway because the temperature of the ice is not maintained by external temperatures. The temperature of the contents of the bowl will eventually rise to ambient temperature. The only thing the salt will do is melt the ice faster, but NOT lower the temperature of the water (noticeably). Cold water from the refrigerator combined with ice will do a much better job at cooling your drink faster than room temperature water and ice and salt, where you are relying on the salt to melt the ice faster. You are better off wrapping your can with one of those flexible ice packs from the freezer, which is what I do if I haven't had the forethought of putting my warm-ass cans of beverage into the fridge or freezer ahead of time. The contact from the ice pack directly to the can cools it to 40 degrees in about 3 minutes.
You can probably put it into a refrigerator for about 2 minutes and get a chilling can be which is more than 20 degrees difference.😉😈waste of ice, water and salt!!!!!!
