When entering my meal expenses during business travel, do I itemize day by day or can I just put total expense for the year?

I am a home health nurse and I travel daily. I am too far away from home to return to my home to make a meal for myself and then continue with my visits on a daily basis. It is more logical for me to grab something to eat in between visiting patients as opposed to adding even more miles just to go home to eat. Can I put just one entry for my meal expenses or do I need to itemize day by day?