There are various techniques for popping corn. Along with prepackaged popcorn, which is generally intended to be prepared in a microwave oven, there are small home appliances for popping corn or you can DIY a soda can popcorn machine.
You can buy a popcorn popper specifically made to use over a campfire, but if you don’t go camping a lot it’s not worth the money or storage space. For the occasional trip, all you need to make your own popcorn is an empty soda can.
This Video shows how to reuse empty coke can to make a popcorn maker.
In this Instructable, This guy shows how you can turn a coke can into a popcorn maker.
He uses old Coke cans to create the popcorn machine,he cut a rectangular shape into the first can, leaving the top attached.