Hey, i might have a better idea but i wont have the bud money till my paycheck on the 5th, and even then i probably wont buy any.

anyway, instead of using light bulbs, which might have chemicals and can break easy, how about one of those small gerber baby food jars. the hold about as muck as the light bulb, and you can heat up the glass and it will stay hotteer longer cause it is thicker.

what do you think, could it work? just poke 2 holes in the lid and put an empty pen or strw in one side.