My wife's maternal instincts have been awakened at seeing the junk food that is consumed at my D&D game. She is considering making soup for us.
Ha! This would only work if we played at my house, and even then, she'd be more likely to a) abandon ship or b) get curious enough hanging around to join us.
Soup and D&D do not mix. Nothing that leaves spills should be on the table, unless you adjourn for meals, which I don't recommend unless you are playing 8 hours or more at a time. You may only eat things that do not stain paper or spill, and which lick easily off the fingers. For this reason, Cheetos are also bad.
I eat pizza and have done so for 30 years. It can be held in one hand, generally protects the paper, and leaves nothing on the fingers that can't be easily licked clean. It's tradition. At least through college, it was also the tradition that GMs did not pay for the food, leading to the phrases "any DM worth his pizza" or "the DM is worthy of his pizza".
Pizza is however causing problems for me right at the moment, as I've figured out the reason for the necrotic tissue and periodic organ failure wasn't exposure to plague zombies but a wheat induced autoimmune response. Clearing the wheat from my diet has largely cleared up the problem, but while pizza every 2 weeks isn't killing me quickly, it's still leading to unpleasant headaches and other allergy type problems. At some point, I'm going to have to start bringing my own food.
Things that work:
Pizza
Sandwiches (use rolls or other stable bread, avoid things like hot dogs that have lots of condiments that ooze about)
Unsalted nuts
Crudités, sliced baguette, and dip
Chips provided that they can be held relatively 'cleanly'. Sunchips were traditional in my group in high school.
Chicken Fingers (Cane's has been a staple for the last 10 years or so)
Jerky
Pretty much any finger food style appetizer
Avoiding wheat is such a pain. There is hardly any good gaming food that doesn't have it, because its pretty much essential to food that doesn't rely on a plate, knife, and fork.
Dr. Pepper is the traditional beverage, but one of my GM's preferred Coke and I have a Pepsi drinker in my current group.