substitute "crapping pants" for talking and "whiskey" for "water" and you've got....
Oh wait, I forgot where I was.
No, YOU KEEP WRITING!
The best thing I EVER heard (and the only valuable thing) Piers Anthony say was about writer's block. You just keep writing. If you can't stay on the plot you start typing your thoughts out, preferably about what you're stuck on. List what your options are for what you can't decide. Brainstorm. Just do it on paper, and do it right there where you were.
example:
... and that's when things got really crazy. ...
...
Ok, why are they crazy? is it because her drunk friends entered? I guess that's a possiblity. What about an old love interest? yeah. the guy I mentioned from college. He was just gonna be a name, but I supposed I could make him a real character. Why is that so crazy though? Maybe he....
and so on....
A helpful way to start is to include a character combination that will be unique and not appear anywhere else in the book. Like %%%%%. Then you can find really fast where your actual sotry ends and the rant begins, which allows you to review it or cut it out really fast.
Chat is actually better than talking, because you can write it out. You just can't afford to stop writing, even if half of it is stuff you'll never keep.