My best advice is to pick a day or two during your week, (I like Sundays) and cook a shit load of food. I get out all my tupper ware and make lunches for about half the week. Cook up a bunch of chicken breasts, undercook slightly so they wont dry out when you reheat. Combine with sweet potato, brown rice, etc, and veggies like broccoli and you have your pre prep'd, healthy meals.
Protein shakes are good for snacks and breakfast on the go. Also yogurt, fruit etc.
Whey protein powder
Fish (I like Tilapia)
Whole wheat bread