I thought this episode really reflected someone who has drank too much and is regretting it. Of course, not to many people have a delusion that has a name ( of a bottle of alcohol ).
However, the feelings of guilt followed by the wanting to be sober period, I have definately seen before. Rocco in church imagining the great big bottle of alcohol was classic.
Nitz ends up deciding not to drink-- after getting a fake id, and when a sober Rocco decides he won't help him learn to drink. A very mature decision indeed.
The episode is worth watching just for Rocco's delusions.