If it happens again please consider not bailing him out. The two or three days in jail won't hurt your child nearly as much as an alcoholic father does, and already has.
You must allow him to suffer the consequences of his drinking. When you don't, you hurt yourself, you hurt your son, and perhaps most of all you hurt him.
I say this as somebody who has lived a similar scenario to the one you described in your post, jail and all.
Take what you want and leave the rest.
Cyranoak