You could plan a number of different kinds of menus. An Indian one could include a range of stuffed parathas cauliflower, potato, mooli, methi or paneer. Some interesting pickles and salads would make a wholesome complete meal. Plain parathas too work well with a dry vegetable a nice, khatta Alu, or dry cooked cauliflower or peas if you prefer. Add keema for the non-vegetarians.
Biryanis are easy to carry along too.
Complement them with a kachumbar finely chopped onions, green chilies, tomatoes, fresh coriander steeped in vinegar and sugar. Fresh or bottled chutneys certainly add to the meal. A continental meal could include roast chicken with a potato salad, some winter greens and some interesting breads. If you are taking a salad, however, cut it in advance but preferably dress it just before eating. Another idea for a western menu could include quiche with a fresh green salad.