Take six pallets and fill each with four-inch fibreglass insulation. Build five sides of a cube, leaving the top open. Line all the exposed surfaces to seal off the yeuch fibreglass. seal and make a lid with the last pallet. Put a bag of ice in a large bowl in the bottom, then add your volatile fizzies. Put the lid on and cover with a tarp to keep the wind and rain out. I have no idea how often you will need to replace the water with fresh ice, but it probably won't be horrific and will drop the temperature to below popping point.

I don't think @enchantedspirit will be trying this, at least not at first, but I want to.

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