Can I combine per diem meals and travel actual meals in the same trip?

No. You must claim per diems OR travel actual meals for the entire trip. 

If you have a business meal during a trip when claiming per diems, you must deduct the meal from the per diem and claim a business meal. Business meals may be paid for with a T&E card, but individual travel meals should not be purchased with a T&E card when claiming per diems.