I would wrap your camera in a towel, sit it over a heating vent in your house for an hour or so, and you shouldn't have any problem.

When I get in my car every morning, I put my sunglasses over the windshield heating vent, and in a few minutes, the glasses are warm, and they don't fog up any more, so I'm sure this is your best solution.
I think this would be far preferable than spitting on my sunglasses!

Matt Pacini