Seriously, I tend to stick to £8/£9 wines that go on offer for £5 and the offers change every week so you have a good selection to choose from, and ales Asda do 4 for £5 mix and match, Hobgoblin is one of my Fav's, we do one or the other once a week, and only my partner eats meat so we get very small portions from the butcher, last time we was there just 4 thick slices of decent ham, £1.80 and that did her two good sized rolls for two mid day lunches with pickle crisps etc.
Trust me it can be done, I'm very flexible, take Aldi weekly super six deals, total bargain, I often let that dictate what I'm eating that week, not the other way around, I let the offers decide what I'm having for dinner and the money you save allows you to afford to have a few little luxuries, butchers, deli counter etc, but even then I always ask whats on offer, also learning to cook meals from scratch helps a lot, soups, homemade bread etc, very cheap, and like I said keep stocking up on very cheap items if you see them, for example Branston beans, sometimes they go stupid cheap, 4 for £1, I'll buy five of them, that 20 tins for £5.
Also If I'm off work in the evening I'll take a stroll to my local Asda and they very often have last day bargins, today for exmaple, hot cross buns, 4 for 6p, yes, 6p, that's my breakfast sorted.
And to follow on from my previous post don't write-off places like Poundland letting your pride get in the way, yes a 'lot' of stuff in there is junk, but they do have some decent named products in there that you genuinely can't get as cheap anywhere else, they just work off the principle that you pick up a load of the tat as well and that's where they make there real money from the cheap Chinese manufactured stuff but I don't fall in that trap.