Also in the way of food and drinks:If you can stomach them, having a a protein type drink each day can also be fantastic (even "diet" ones like Slim Fast or Ensure) Because they are full of the vitamins meant to replace meals.
I second this. I'm not really a vitamin popping kind of person, but when I'm larping, for some reason I just feel less crappy over the weekend when I take them everyday. Placebo effect or not.