surely a glass wouldn't hurt
How many drunken years could I have spared myself if I didn't tell myself that same thing?
Every time I meddle with the Pandora's box of alcohol, it takes all the discipline that I can muster (often after years of daily drinking) to shut the thing up again.
One glass? Isn't that like kissing your sister? I would have a glass and buy a bottle on the way home.
Maybe you are different. Maybe you can go through a recovery and return to safe and normal drinking; I've never seen that though. Never even heard of it.
Compared to the chaos and nonsense of drinking all the time, simply abstaining is actually a nice life, in my opinion.