I know it's not easy in formal social situations. I was a military wife for many years and was involved with lots of entertaining in situations where I didn't know anyone. I didn't drink at all at the time - it was later in life when I began drinking. So, I relied on water most of the time. I'm not big on small talk and mingling, so it was a challenge and I can't say I enjoyed it.
One thing that might help is to arrive late and leave early, if you can.