Good point that no one buys coffee in a can anymore but the citronella candles sometimes are in a little bucket and are cheap. Just ditch the candle and put a couple charcoal brikettes in it.
We do lots of local camping and there used to be a couple that camped in the same area as us. They would sit outside every night and get totally smashed from about 4 pm when they got home from work until 8 or 9 pm. The guys wife would get so smashed that she must have been keeping warm on the bottom side by relieving her bladder. These folks have a problem. I guess its a temporary warmth! I don't think she knew she even wet her self. Note: Don't try this at home kids!!!