Help with the geothermal spirit: portable warmer powered by batteries?
I need some suggestions regarding the geothermal combustion of the spirit of earth. I am trying to use dry ice for making artificial smoke, but I have encountered some problems and I would like to hear your thought on them:
So far I have only been able to make the fog last for about 30 minutes. It lasts as long as the water inside the container remains warm. In other words, once the dry ice cools the water, there is no more fog. To fix this, I need to find a way to warm the water in a portable, safe, and economic way. The water does not need to be hot, just warm. The problem is, all the water heaters that I know are too big for the head dress. They also consume large amounts of energy and thus require a big heavy battery to power them on (i.e a car battery)
Question: does anyone know of a portable warmer powered by batteries?