The only thing that we bought was additional carts to haul the food to the serving station. Equipment is not a problem because you have most of it already. Even with the breakfast in the cafeteria we use disposables. The custodian or cafeteria worker picks up the bags from each class and disposes of the trash. If you feed in the classroom, there's no need to clean the cafeteria.
Every classroom has a garbage bag.
Some districts have been able to offer extra hours to employees that were only working part of the day. Some schools use students or volunteers to deliver the meals to the classroom, so it didn't increase their labor at all. Some schools are doing a simplified menu, so their labor is being used more efficiently. It takes less that 7 minutes to serve 500 students, and it takes less than 10 minutes to eat the breakfast. Wow, that's some fast food.