You *can* use foil for the bowl, but I've heard varying rumors that using foil is bad for you. I simply use a small socket used for wrenches and cut a small hole in the lid for whatever container you are using and put the socket through that hole. Make sure the hole in the lid is small enough so that when you put the socket in it, it fits in so tightly that no air can come through there.


Good luck and happy smoking!