I am not sure how you could put it on a separate bill because the daycare food and family food intertwines.
I cook a large batch of food that lasts for my family's dinner as well as the daycare's lunch the next day. Also snacks I might buy go to my own children as well as the daycare children so not sure how that would be possible to keep separate or on different receipts.
My accountant said that some portion of my groceries is covered. I forget what percentage.
basically I save all my grocery receipts and enter them into my spreadsheet and then I give my accountant the spreadsheet every year and he does some sort of formula for whatever portion I am allowed to claim.