Chocolate + me = CREATIVITY
When I wake up I can't get going without a tall cup of hot chocolate. When I write I usually have another cup in arm's reach (but out of spill-range). Usually it's in a tall san francisco cup that has a small chip in one side. Not to mention I have a stash of chocolate. Most of the time there's a stick of Toblerone in there mixed in with bite-sized hersheys or lindorf truffles or something along those lines. Better is if I have a home-made baked good. As long as there's chocolate in it somewhere.
I hear that Chocolate, and I mean the really dark stuff, is actually good for thinking. Science isn't my strong point, but I believe it improves blood flow to the brain or something.
Guinness
Actually, having a pint with the writing is more about the ritual than about the "food". Same with other strong drink. I don't know that it's the drink itself that provides the inspiration, but rather the fact that it sits there in a glass next to the laptop and contributes to the mood.