I made two bongs out of the two bigger Gatorade bottles and on the side I put the top ends of regular water bottles to fit the downstem in. The downstem is an Empty metal flashlight (So basically an Empty metal tube). The end of the tube screws on and off and i have fitted copper mesh in a nice bowl shape so it makes a very great bowl. The two smaller Gatorade bottles are percolators that i have made them to be able to screw onto the two bigger Gatorade bottles, AND the smaller percolator could be screwed onto the other percolator to create a double perc bong! What do you you all think?