It’s Friday afternoon, you have just got home from work, ready to open up a beer and celebrate the end of the week. There isn’t any cold beer. Fail time.
Chemistry to the rescue.
What you need is some water, some ice and some salt.
Fill a vessel with the above – lots of it – enough salt so it stops dissolving. Then fill it up with heaps of ice. The salt lowers the freezing point of water. The water distributes the cold of the ice because there are so many more contact points with the bottle of beer. Using this system, you can drop the temperature of a room temp beer to cold in under ten minutes.
However, you will need a lot of ice. The cold packs also work well.