No sweat, man.
- Buy the biggest inflatable swimming pool you can find -- they should be dirt cheap at that point.
- Dump a truckload of ice cubes in there, and stomp around, packing them together around the sides and bottom.
- Fill the pool with gin and tonic water, 1:2. Don't forget a squirt of lime juice.
- Drink the gin & tonic -- quickly! *Very* quickly! (You may need friends/neighbors to help with this part.)
- Invert the swimming pool.
- Presto: IGLOO!