NSD yesterday, this summer school is great for that I usually have 10-12 NSDs from a fortnight. Then they give you expenses and pay you!
When I get home I'll be finishing some small DIY projects to freshen up the house, all the stuff has been purchased already so it won't cost much if anything. Then preparing for the next academic year of teaching.
thelongdark - a Terry Pratchett inspired NN or just a coincidence? 
As for the healthy eating, could you try batch cooking and freezing things you all like, you can sneak a LOT of veg into blended pasta sauce, bolognese etc which both bulks it out cheaply and is healthy.
Also how about having meals made up of lots of smaller bits, sort of like tapas but less effort, we do hot and cold versions of this.
Cold would be: carrot, pepper, celery, cucumber, any other similar veg chopped in sticks, cherry tomatoes, homemade hummus, crackers/breadsticks, olives, olive tapenade, any cheese/ham we have in, we lay it all out and everyone takes the bits they like.
Type 2: large spread of little bits of anything we have in: e.g. a few sausages cooked and gone cold, hard boiled eggs, salad leaves, bowl of grated carrot and beetroot, cheese, bread, slices of quiche, all set out and also I'd heat any leftovers e.g. pasta dishes, fried peppers and onions, (even put out a small bowl of warmed curry once!!) and again people help themselves to the bits they like.
This is also very good for using up small portions of things which might go bad otherwise.
I also make huge batches of tomato and veg soup with either red lentils blended or cannelini beans, I blend it completely smooth and freeze, we sometimes have a bowl of soup with crusty bread and e.g. an egg, or sausage chopped in, or tofu cubes scattered over. It's very quick and easy as soup is ready made in freezer.
Final one is a noodle soup I make - cook egg noodles and set aside, then stir fry garlic, onion, ginger, add shredded veg (e.g. cabbage, courgette, carrot, pepper, mushroom, leeks - anything chopped finely basically) and fry for a few mins until starting to soften but still with a bit of bite, add chilli flakes if liked, then re-add cooked noodles, with as much chicken/veg stock as it takes to cover, add soy sauce to taste (I add too much!) and sesame oil to taste. I also add sesame seeds when I have them. This keeps well for lunch the next day.