Patrick Haughey, bartender at Excelsior (272 Boylston Street, Boston, 617.426.7878)“Before or after you start drinking: B-complex vitamins — very important. Obviously water, if you get the chance, but sometimes you forget it. And in the morning, if you feel terrible, my remedy is the old, old man remedy: bitters, soda, and, if you can’t handle the taste, a little lime. I don’t know what it does, exactly, but it definitely helps the stomach. It tastes gross at first, but by the second one, usually your stomach feels better, and it takes a bit of the edge off the headache.”