In order to make a tiny flamethrower out of a water bottle, you will need the following: an empty water bottle, butane, a lighter, and a sharp implement. Remove the cap from the bottle. Punch a hole in it. Try not to make it too big. Screw the lid on tightly. Place a small amount of the butane in the bottle. In order to make this work, you will need to squeeze the bottle to release a little butane at a time. Place the lighter in front of the bottle. When you light it, you should begin squeezing the bottle. This should not be done in small confined areas.