One note: if it behaves like dry ice in a cooler does, it can carbonate many of your food items. I've used dry ice on camping trips and ended up with carbonated fruit.
I would calculate what it would bear in terms of recarbonation, get the flat soda very cold (carbon dioxide enters solution preferentially at lower temperatures), weigh, drop, cap, and roll it down a hill. If no explosion, wait a couple of minutes just for safety.
