Ooooooo....now that makes sense.
Here's you answer:
"Hemingway was notoriously fond of drinking, but he refrained from indulging while writing. When asked in an interview if rumors of him taking a pitcher of martinis to work every morning were true, he answered, “Jeezus Christ! Have you ever heard of anyone who drank while he worked? You’re thinking of Faulkner. He does sometimes – and I can tell right in the middle of a page when he’s had his first one. Besides, who in hell would mix more than one martini at a time?”