welcome to the forum -
You asked some specific quesitons and I am not sure that I can answer them for you. As an addict blessed to be in recovery, all I can give you is my experience, strenght and hope.
My experience comes from a 12 step program, and that is what I suggest for you. Find meetings in your area and attend as many as you can, meet other people in recovery and take suggestions from them. that is the first step my friend.
As for the free alcohal, well I stay away from places where people are drinking, but it sounds like in your line of work, that may not be possible. Meetings and recovery will also help you learn how to say no, free or not.
Good luck and keep posting we would love to hear more from you.