I’ve done it.
But I’ve done it coming from a place of plenty, so have a vast freezer and a decent spice rack etc.
Can do the first 2 weeks without spending anything except milk for the baby.
After that it gets trickier as frozen veg and fruit starts to be used up.
But we did it for months when we had to. You get to know what time of day different supermarkets discount their meats (3pm on a Sunday is good for cheap joints).
Lots of pasta, lots of rice, lots of pulses. Any leftovers into tubs and in the freezer to avoid being picked at later on - in fact when cooking large batches, hiving off the freezer portions first.
This time of year we have hedges full of apples and blackberries. Local farm discounts pumpkins massively after half term - last year they were giving them away free by the end of November. Eating seasonally there’s usually some cheap fruit and veg available.
Taking the kids to Tesco so they can chomp on a free apple on the way round (from the box of “please let your children eat this fruit” stuff not just from the counter). Walking through another supermarket on a Saturday morning for the free samples.
Getting to market half an hour before closing andfilling carrier bags full of veg for a couple of pounds.
But all of that I could only do because I had the freezer already, because I’d been taught how to cook, and because I had too much time on my hands. It’s much more expensive if you have no freezer, or if you have one but the leccy’s on a pre payment meter and you can’t keep it topped up, if you are working three jobs and still have to turn every penny twice...
For anyone reading this who is desperate, I’d say look and see if your town has a community fridge or a community pantry. You don’t need referring there, anyone can use them, they’re simply an outlet for food which would otherwise go to waste. No one cares what your income is, you just turn up and take what you need. Ours has masses of fresh produce most weeks and fresh bread too. www.hubbub.org.uk/the-community-fridge