Damn dude. Bowls are so easy to make that it's dumb to smoke off tinfoil or cans. Unless you live in an insanely tiny town then there just isnt an excuse. Here's three easy ways I've made bowls:

1.Using a Ratchet head and a screen that I stole off the bottom of a small pipe @ work.
2.Using a brass pipe size changer thing and a screen, bought for a total of $2.79 at hardware store.
3.Ripped the top off an old coaxial cable ((The cable you plug into the back of your tv for cable)) and just superglued a part of it so it didnt have any moving parts.

I'm sure there are a million other ways to make bowls man. Be creative and don't make em outta shit that's gonna kill your braincells. Or just roll a joint.

Encatuse