the last homemade bong i made was very sneaky, can u guess? Out of a mini water pistol.the only thing u need is a water pistol and the stem and bowl from a small ready made bong.hopefully the hole u poor the water in is on the top side of the pistol, so you insert the stem down that hole to the handle and just glue it where it connects at the hole(i used silicone glue, it works every time).Then take out the tube that supposed to be the barrel of the gun(this is where u are going to inhale from.put water in but make sure it doesnt go over the hight of the handle, making another hole for the air intake is optional but its best u do.Just so u can picture it u are pointing the gun at ur mouth.if the hole is on the bottom of the handle then simply make a hole on the top!From now on you know what u MUST do.hope i was helpfull.