There might be issues with taking your own food in. I worked in a place once where two kids had severe allergies, so there was a strict policy of no home foods, so that we could be sure there were absolutely no traces of eggs or nuts. So check that out. But if not, and you want to take your own food in, then that's a good idea.

The centre has to display a menu - if you want your child to eat their food, check it out, and if there's anything that looks offensive, ask them "What will my child be having instead of Arrowroot biscuits?" (as an example) That should be a pretty good but subtle clue that he shouldn't be having whatver is planned.

Communicate, as much as you can, it's the way to keep on top of it. If it is a fully catered place, then they'll have a cook on staff. Make friends with that cook. They're the ones that run the place