If they want special food, they send it, no discounts given.

I have a 3yo dcb who gets spoon-fed baby food at home - yep, it's ridiculous. So I give him what we are all eating and when he refuses it, as he does 99% of the time, he gets an applesauce or pouch of baby food from home, put in a bowl and handed to him with a spoon. I have trouble even with this, because I think his food issues are almost completely stubbornness and habit-based, not an actual issue. BUT not my kid, and that's what the parents want. So they supply it all.

I had another who was autistic and mom decided that a dairy-free, gluten-free diet would "cure" him. I said I could not accommodate his diet, so she sent all his food every day and never asked for a discount. With the amount of extra work he was though, she probably understood that a discount wouldn't have been fair.

The only thing I have accommodated was a severe peanut/tree nut allergy. I agreed to take on the child and my house became nut-free. They were my first clients and I really wanted to sign them, so my husband and I discussed it and committed to it. We've been nut-free for the last 2 years. We are moving now, so I am losing that family, and I won't be taking on another serious allergy unless I have absolutely no choice.

I'd be more inclined to think about accommodating an actual allergy, instead of a specific diet that mom and dad have just decided they want the child to eat. If they want to be that picky, then group care is not the right fit for them, and they should look at hiring a nanny.