Sobe Bong Question:

Hey guys,
First of all, I'm a fairly new poster here and I just wanna thank everyone for being so helpful and just generally cool people. But onto my question.
I'm planning on making a Sobe Bong today, but I don't have anything to put in the cap as a bowl. Could I just poke the hole in the cap and put tinfoil in it? If not, where can I buy something to use as a bowl? Thanks a bunch in advance!

no you cant do that, theres no suction, you need something that goes into the water to create the suction