If you want to cool a warm beer or soda to ice cold in 3 minutes, put the can (or cans) in a pot and cover with ice. Next, add 2 cups of salt and fill with water. It will be ice cold in 3 minutes!
This works because salt melts ice and lowers the freezing point, making the can cooler than if you only used ice.
Enjoy your cold beers on these hot Sydney summer days!
x Sunny x