I found this bong image and cropped it and dragged it over to the main source image.
step 2 of 4
Selected the bottom of the bong and using free transform made it look more flat.
step 3 of 4
Cropped out this picture of a beer and dragged it to the main source image.
step 4 of 4
Made the bottom of the beer flat and changed the perspective of the beer in the glass to appear more level and using color replacement tool, removed the original source beer background to match the main source back ground and used Gaussian blur to make bong and beer appear in correct resolution and adjusted brightness/contrast.