If you qualify as a family daycare provider and provide food for your daycare recipients, you claim those expenses as business meal expenses. You can't deduct the cost of food consumed by you or your family.
When claiming business meal expenses, you can deduct 100% of the actual cost of food consumed by your daycare recipients, or you can use the standard meal and snack rates.
See IRS
Publication 587 for details, including record keeping requirements.