I sorta do both. I supply food and drinks for most children but if a child has a dietary issue, the parent supplies it.

I have had 2 children who were sensitive to dairy/milk so the parents supplied the first carton of milk. Once I know what brand they use, I buy it with my normal dc groceries. I bought lactose free yogurt for the one boy as well. The one I have now just needs a different type of milk but can handle small dairy intake.

I have a new child who started today who has a milk allergy so the parents are going to be sending the food every day. Once he is here a bit longer and I know what he eats, I will supply the snacks and the parents will just be required to send his lunch and his milk as he is only here 2x a week.

I don't charge any less for this and actually, just increased my rate and the new boy pays that. I know some dcp's don't like to have children eating different food but it doesn't bother me and I find it's an opportunity for learning. Once they go to school, most of them will have different lunches.

I don't mind doing the cooking for dc but I think parents supplying it is a good choice too. Especially these days with children and food allergies and children who are picky eaters.