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?

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

before i had my pipes i used to make those. i had one for a long time that used a .40 cal brass bullet casing with the primer removed as the bowl. i cleaned all the gunpowder residue out with peroxide and alcohol. i used a bic pen for stem and connected it all together with electrical tape. it was pretty macgyver.

you can make a lid out of a pop bottle lid and tinfoil, no prob.

Poke a hole in a beer bottle cap, and bend it up right.