The synopsis from the official movie website says it all:

Luke and Kate are co-workers at a Chicago brewery, where they spend their days drinking and flirting. They’re perfect for each other, except that they’re both in relationships. Luke is in the midst of marriage talks with his girlfriend of six years, Kate is playing it cool with her music producer boyfriend Chris. But you know what makes the line between “friends” and “more than friends” really blurry? Beer.

Well, maybe it doesn’t tell you everything. Olivia Wilde (Kate), Jake Johnson (Luke), Anna Kendrick (Jill), and Ron Livingston (Chris) are perfectly cast.

With Drinking Buddies writer-director Joe Swanberg makes what we could term a “craft movie” in that it is analogous to the Chicago “craft brewery” that functions as a central location. It’s a small film with a personal feel; let’s call it individual, independent, authentic, tasty, and occasionally surprising but not quirky.

That’s not a criticism. Who would want a quirky beer?