Quibbling about cheese, bread, and sandwiches solves nothing, perhaps we need to vote for people who can put good policy in place.
This is the only way to move forward, I think. As long as we have people on wages that don't pay the bills, policies that encourage people to stay on lower hours in case they lose benefits, zero hours contracts, unaffordable housing and expensive utilities then no amount of lectures on 'making ends meet' will be of any use.
It is easy for me to cook from scratch and make tasty meals, as I can afford the fuel and have a pantry full of herbs, spices and condiments that add flavour. I usually just have to shop for the main ingredients when I make a meal, as the 'incidentals' are already in the kitchen.
I picked up a book in The Works which is called something like Vegetarian £1 Meals (I'm not at home so can't check the exact title), and yes, you can make some interesting things for under £1 a portion, but that assumes that you have seasonings as well as things like soy sauce and tahini, and that you are making enough to be able to use a small handful of chopped herbs or one sheet of lasagne each, and not have to buy a large bag or a pack of pasta to make a meal for one. Even doubled up, it would be impossible to make them for £1 a portion if you have to do that.
Also, there is often an assumption that everyone lives near an outdoor market where you can pick up a punnet of this or a bag of that for peanuts, which many (if not most) people don't. I live in a market town, but the market is once a week when a lot of people are at work, and it sells farm produce at a higher price than the supermarket. My nearest large supermarket is a car drive away, so if you don't drive and can't afford delivery you need to pay ££ for a taxi or only buy what you can carry on the (expensive and irregular) bus. That makes it difficult for people to have fresh food all week, as things go off before the next shop. There's M&S food hall, and a high street grocer, but both are expensive and the grocer is closed before most people are back from work. It's not surprising that a lot of people are struggling, and it must be galling to have people (like me) who are used to having Sainsbury's bring the weekly shop and top it up from the farmers' market telling them that they just need to plan and budget better.
We need a better system of taxation, and I'd also like to see government intervention to regulate the prices of utilities and basic food. Nobody should be even thinking about making 30p meals - it's ridiculous in a country that may be sliding down the tables, but is still one of the richest in the world.