The one picture does look like a beer bong to me. And it looks like liquid in there. I’m not familiar with a pot bong so I know nothing about them.
We did lots of beer bongs in college, etc.
Ya know, these photogs that work for the gossip rags would be chasing him down with a shutter cycling fifteen pix a minute if they witness Phelps hitting a bong.
Somethings a skew.