What to eat at brunch
Regular old breakfast food. Don't try to get cute here with the triple cheeseburger or the bowel-angering huevos rancheros from a "New American" restaurant. Consume eggs, potatoes, and bacon. If someone doesn't want their potatoes or bacon, take them and eat them. Even if you eat everyone's potatoes and bacon, you will still not be terribly full, which means you will be ready to drink more. If someone doesn't want their eggs, do not eat their eggs, as that is much grosser for some reason.
What to drink at brunch
Two drinks, maximum. Remember, you're not doing the all-you-can-drink, because you listen to me, which means you'll only be there for an hour or so. The most dangerous thing that can happen during that hour is succumbing to the classic hair-of-the-dog over-drink. Need an extra couple because you're feeling crappy? Apparently you didn't listen to me! Or the Night Before section.
But even if you didn't, it's too late for that now. The main point is, you can't drink your way out of this hole all at once. The food will help, and the two drinks will help more. By the end, you'll find yourself smiling without trying, and actually participating in conversations. You're back to normal and set up for a solid slate of Day Drinking.