HotI we do it on a very low income, DP is a butcher apprentice although this does mean we get a lot of random low cost cuts etc, the wage is very low so evens out a bit if that makes sense and Im a SAHM. The most expensive things for us are the various specific "special" seeds, grains, nuts and oils (coconut etc) but a lot of it goes far, lasts well and can be sourced in bulk, I find we dont need a lot between meals to feel full so anything we make lasts ages. For meat, try to go for the cheaper underused cuts, when cooked right they are just as brilliant as any other. Can give lots of tips about that or well, DP can through me lol. We grow our own herbs and a few other bits and pieces that also helps add a lot of flavour cheaply so worth looking into as it is super easy and doesnt cost much to set up. We dont eat potato (Ive just never liked the taste lol yep, Im odd) but you can bulk things out with the cheaper vegies like carrot, beans, zuchini, whatever is on special which is what we do. We save everything and use up everything so lots of complimentary meals - roast one night, the meat will last another meal then the carcass for stock with all our vegie off cuts (save them from all meals in the freezer to use) for a soup base that then will last lunches for a week. At the end of our shopping cycle we always stirfry whatever vegies we have left over etc. There is heaps of tips around for stretching your money further! And ways to search for meals out of whatever is left in the cupboard/fridge.

Also because basically all take out is off the menu as well as prepackaged snacks, drinks (we only have water and some milk for the kids and in things) etc means you save money there. DP takes lunch to work and I always take snacks etc out with us so we arent spending money there.

The other thing is you dont need to go all in straight away, small changes are better than no changes so do what you can manage as you can manage it