Ok - the hair on the back of my neck is standing up. You have a DUI conviction, he is toting bags of bottles to a job site and has a locked fridge?
It sounds like both of you need to be in counseling for alcohol abuse and all of the issues that it has brought into your life. My concern isn't him bringing up your drinking or vice versa. My concern is either one of you taking full custody of a child without facing that alcohol is a major part of your life and by extension your childs.
I'm with Jersey Girl on this one the point wasn't that you where coming from the family function but that you drank and were driving with your kids in the car. This divorce if you decide to go through with it is going to add presure on you maybe it would be a good thing to seek counceling and get some help.
I need to do so for my probation, which I am in the process of doing. It may or may not matter, but I have been doing everything that the court has instructed me to do. I believe that with my compliance and the fact of my husband's daily excessive drinking, that the court would see things in a different matter. I am going to continue with the divorce and get custody, find the accounts he hid, ask for spousal support and obtain the necessities that I need in order to live.