Typhoon boss offers to pay for food at the hors shows when I get there. I almost always decline the off as I have snacks in the truck. Besides, I've learned that most of the food at those shows suck( overcooked, cheap crap that they over charge for), or is vegetarian and over priced...
My go to snacks are old trapper original beef jerky, jelly belly jelly beans, crackers ( Ritz, club, or another flavor), cheese it's duos. Keep some jerky in the car and munch on that.