I am really in the mood for a drink.

我现在真想去喝一杯啊。

Great, let's stop off at the bar around the corner.

好啊，我们去旁边那个酒吧。

Do you want a drink?

你想喝一杯(酒)吗?

This is my treat.

这次由我请客。

It's my treat today. I'll pay.

今天我请客。

I will pick up the first round.

第一轮我请客。