Thanks hikermor! It's good to know what the differences are. This is more than just a 'make camping stuff on the cheap" process for us. It's also a science experiment so we're going to try it both ways.

I'm currently on the hunt for a good website for kids to help explain some of the science, so we'll have a better understanding of our own observations. If anyone knows of such a site, I'd be grateful for the guidance.