Are you asking as a day care provider? If so, then if you're licensed, I strongly suggest joining a food program. There are a number available, and if you want to email me, I'll be happy to talk to you about making a choice. But they're all going to reimburse you for a portion of what you spend to feed the kids, in exchange for meeting certain dietary guidelines. The other thing is that most of them will provide you with free software to track the meals, but it also does your accounting. There are a lot of things to consider, such as your "space-time percentage," which has to do with how much of your home-related expenses you can deduct, and it helps to figure them all out.
My husband does not do day care, so we've just arranged every year to have a little extra taken out of his check. And for three years, we haven't had to pay anything. It's worked out well for us. I would also recommend that, at least once, you see an accountant. We use one every year, but at the least, he or she would be able to help you with what you need to keep track of and what to consider when doing your taxes. I know ours has always thought of deductions we hadn't thought of, saving us at least the cost of his fee.
I also recommend that you get a tax ID number so that you don't have to hand out your social security number. It's easy to do, and I'll be happy to talk with you more about that too, if you have questions.
Good luck. Taxes are confusing!