Well when I used to do that I used a rolled up square of pop can aluminum..But yea aluminums really bad.

Just go to a hardware store and find out, but dont use copper
MaryjaneAndHashley Reviewed by MaryjaneAndHashley on . bong bowl? im just finishing my gatorade bong (yeah i know it only takes 5 minutes), but am unsure what to use for my bowl. Bic-like pen is the slide. i know foil would work but releases toxins or whatnot, a socket from a socket wrench woudl work, Any other ideas? Rating: 5