Pick one day to cook a lot of chicken, perferably grill it with minimal spices.
You can make chicken salad, chicken pita pockets, chicken rollups, chicken soup , chicken on top of a green salad, chicken stir fry, chicken and pasta etc etc
I agree with the poster below, get a good insulated bag and a big wide mouth Thermos to keep your food hot or cold !!
Bring along some fruit and maybe a yogurt and you are good to go !!