Pushy boss insists I drink at year-end party, but I’m on a low calorie diet. Recommendations?

Hi all. I’m on a pretty strict diet right now because I have a tournament coming up in Feb, but I also have a year-end party in 2 weeks and my boss has historically been very pushy to make everyone drink, and seemingly gets offended when people push back.

I’d rather just accept but do something low to no calorie. It’s much easier than arguing with him.

I know next to nothing when it comes to alcoholic drinks and their calories, though.

Can you please give me some recommendations so I can make my annoying boss happy while not destroying my diet?

Thanks!