easyier method

fill a drinks bottle with bud leaf or trim
poke several small holes in the lid about 3mm diameter
get 2/3 cans of butane for filling lighters or camping
drill a hole that you can put the butane can through
if they give you the adaptors with the can drill a hole for that then put the can into the adaptor
you have to pump the butane through the bud

do it into a pyrex dish let butane evaporate do this outside and do not smoke