Does the person have access to any of the following:
microwave?
toaster oven?
fridge?
If yes this may broaden the types of foods that one can bring.
Personally, I have a small salad (chopped lettuce, tomatoes and cucumbers) with dressing. Place the dressing at the bottom of the container then the tomatoes/cucumbers and then the lettuce at the top. When ready to eat turn over the container and shake. This will keep the lettuce from wilting.
The protein is generally leftovers from the previous day’s dinner.