Um...

A body...find something hollow and of suitable shape...

A bowl...find something the right size you can somehow attach to the body...

A screen...window screens (put them over a flame for a minute to burn off any crud first), faucet screens, tinfoil (I don't even want to explain, just know that it's not going to kill you!), wires...be creative.

Something to seal it all up...Plumber's epoxy works, make sure to let it dry, though, and that it's never under the flame.

Probably a drill or anything that can make holes in the body.

A nail file for smoothing rough shit out.

Otherwise, dude, improvise.