Or go to the camp store at the campground and buy a cup (or a thermos) of coffee. Or the nearest fast food place, gas station, convenience store. How long do those immersion heaters take to boil water anyway?
Withim, I just saw your post - the coffee at the camp store is AWFUL...I will go with the hot pot to get the water hot enough for my coffee press
Clock, I didn't think about it making the mug hot...though that makes sense.