If they have a fridge, I would put it in a small bottle or container that can be put into the mini crock pot, like a widemouth advent baby bottle, they make smaller ones, and he could just be served out of that for warm foods, or some other similar container that fits in a crock pot. It should do the trick pretty easily. They would be easier to wash too, just pop them in the dishwasher. Maybe one of the daycare assistants would make a special trip for you. My son was allergic to peanuts and had to eat most of his meals with the babies in the baby room while he was there.