Ok, I see you've sent him to try and sort some of it. In case he doesn't get good stuff, here's a quick plan based upon a five day working week (mainly because that's how I plan it);
You need some sort of breakfast. If you can't handle toast or cereal in the morning because it's stupid o'clock, you need something you can shove in your bag. Get two boxes of high protein snack bars (three if they're in 4s) and, although they're not as good as real food, 10-12 bottles of a ready to drink meal replacement shake - they're not cheap, but they're still less than getting a takeaway breakfast or not eating at all. Cost per person per week - about a tenner (Slimfast, for example, are about £6 on Amazon). Stick them in the fridge and take one out, take a bar out the box, go.
Buy two bunches of bananas, a packet of ham, a block of cheese and a multipack of crisps (switching out from all takeaway is going to leave you craving salt), along with some pickle/mayo and cherry tomatoes and a couple of packs of bread rolls and some cling film. Knock them up (2 per person) in about five minutes the night before, so they can be picked up with the shake, bar, banana and a handful of tomatoes.
Then there's dinner.
Monday. Pack of filled pasta, bag of salad leaves, cherry tomatoes, cucumber/any salad items you like and instead of fannying about with a gloopy sauce, drizzle them with olive oil, sea salt and fresh ground pepper.
Tuesday. Ding dinner. Microwave lasagne on a bowl of salad.
Wednesday. Jacket Spuds. The frozen ones are actually pretty good. Have two with half a tin of beans and grated cheese and salad, or get the little tubs of Philadelphia cheese.
Thursday. Lamb/Pork/Beef steak in a pan, either oven chips and a fried egg each or microwave new potatoes and microwave veg pot.
Friday. Ding dinner. Get a curry meal deal, rice, stick half a Naan bread in the toaster each. Make sure you've got a vegetable side rather than a vegetable snack.
Day off: Breakfast - scrambled eggs and toast/bacon roll/croissants/whatever.
Dinner - slow cooker. Dump whole chicken in the slow cooker breast side down around 12pm. Put on low. Forget about it until you can smell it. Serve with shop bought mash, tub of microwave veg, Bisto. Leftover chicken can be used for the next day's lunch, added to cooked plain pasta and a tub of cheese sauce, added to a jar of curry sauce to be served with microwave rice or whatever else you fancy - including picking at if you're hungry.
It's not a cheap way of eating - however, it is quick, significantly less than the cost of takeaways, won't take long to clean up from and is still more nutritious than a burger and fries from the kebab shop and pizza every night.