Community fridge or community pantry. Some you pay, ours you don’t. They aren’t just for people on low incomes, they are for any one at all to use as they are simply distributing food which would otherwise be thrown away.
Supermarkets and wholesalers donate short dated or slightly over dated but still fine fresh food - lots of bread, fruit and veg in ours, and you take whatever you like.
In some areas people with allotments donate their excess and swap it for dented tins of soup etc.
It really is just food which would otherwise be thrown away so please do see if there’s something like that near you.
There is zero shame in visiting a foodbank - you don’t have to have exhausted all your savings before you get there. And you can always donate food yourself yourself once things are a bit less stretched. If it helps to think of it as a food loan, then why not? Things won’t always be this tough, and one day you’ll be able to help fill their shelves ready for the next person who needs it. Ours also has links to various organisations which can help with money management, checking you really are getting everything you’re entitled to, that sort of thing. No obligation to take them up on it, just an extra service they can offer. Job centre or school can refer you.
Depending on where you live, you may be able to sort yourself for fruit without spending a penny - blackberries, apples, plums, etc. growing beside footpaths and in hedgerows, or ask on your local community Facebook page and you may be inundated (with apples and marrows mostly but they’re filling snd tasty at least).
And the other suggestion is that whatever you cook, serve it up yourself. If you’ve planned enough for two meals, take the second meal out of the pot before you put it on the table. Then it won’t accidentally get eaten. No one will starve if they don’t get seconds, and if you can get some knock down bread then there’s plenty of toast as a filler for anyone who needs it.
Milk puddings made with half milk, half water are a good cheap filler for the end of the meal. Rice pudding, chocolate cornflour pudding, semolina, that sort of thing.
Pancakes again made half milk half water, with stewed apples for sweet or a cheese sauce for savoury. Yorkshire puddings too - if you can make large individual ones then put a little mince sliced meat into each one with plenty of gravy. All the flavour but mostly cheap carb.
Well done on finding things to sell. Not easy. If you have a mortgage, would they let you take a holiday or do a temporary part payment? I know that’s just pushing the problem further down the line. But sometimes just getting through this week is the priority.