It’s really whatever you are comfortable with and what your kids will eat. For a while, it was easier for me to order a bunch of cheap pizza than worry about having enough always on hand for if a group would show up. I never had a guest only section of my house. My teen son can and still does eat a lot.
Or if you don’t want to order and want food available, go to the frozen section of Costco and buy all of the stuff you normally wouldn’t. They will eat it. Frozen pizzas, cheese sticks, hot pockets, egg rolls, taquitos…