Klavier Gavin doesn't drink coffee, a fact fueled by the awful excuse for coffee in the Prosecutor's office. If he wanted water he would drink water, not the brown watery stuff that isn't water and certainly not coffee.
This is the case until the new man arrives. It's a long night that's only going to get longer with preparations for a convoluted trial.
Klavier doesn't drink coffee until, to many a raised eyebrow from those in the room, a rich smell entices him to the pot. The new man is an oddity, but the coffee is a thing of beauty.
Note: Maybe not exactly what you were envisioning but inspired by a comment from yankeegal13