My daughter has recently gone back to taking a packed lunch. She wasn't eating any veg at all and opting for the chocolate milk, at school dinners, and I was worrying about her diet. She's quite happy to go back to packed lunches and has school dinners only on a Friday, because her best friend does this. She's away today with home made soup, in a thermos soup flask, a bread roll with salmon and lettuce and a yogurt. The soup flask is a great idea, as she only needs to take the lid off and use it as a bowl. You could put other hot meals in there. I'm not sure how hot it would stay, but the soup is fine in it, so long as you preheat the flask with boiling water.
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley