I do eat a lot of 'supermarket food' but I don't buy much of it at all from them. 
I'm about half a mile from a Lidl and usually use that for coffee, bread & milk. Their own brand coffee. 200g. £1-79, large Hovis white ( 800g ) 79p., their own brand Milbona UHT semi skimmed milk, 1 Litre, 55p. I'll drive there if I'm running out, as was the case today with coffee, but if I'm stocking up a bit I'll go by bus to their other store about two miles away on the other side of town and then bus back to the 'top town' shopping area for non-food stuff before bussing it back home. With my OAP 'council taxi' bus pass it's only costing me a little more in time but nothing in fuel. I also watch out for Lidl DIY and similar special offers. Sometimes I'll use Heron for bread and maybe a pack of kipper fillets or frozen breaded fish if I'm going 'down town', usually driving on a round trip to other places, they don't have Hovis so it's usually Kingsmill 'Toastie' 800g @ £1-00. Watch out with bread as not all 'large' loaves are 800g, some are only 750g. I'll also get a few bottles of Ben Shaw's 'pop' from there, 500ml @ 30p each, bitter shandy, cloudy lemonade, dandelion & burdock.They also have a free cash machine in the shop so that's very handy too. Farmfoods is near Heron, their Hovis and other large loaves are £1 each, two for £1-60, but I don't freeze it and only use about three loaves in two weeks.
The rest of my food I buy at the company shop, as Ive said on here before. There's no guarantee what there will be from one day to the next but I've yet to come out without something good for at least the next few days. Tesco, Asda, Co-op, Morrisons, Sainsbury, M & S, Waitrose, Ocado etc., etc. own label and many top brands such as McVities biscuits & snacks, Cadbury and Nestle chocolate, Walker's crisps & snacks, Heinz soups, Nescafe coffee - various ones - currently a 300g jar of 'Original' is £3-79, a 150g refill pack of the same is £1-79, a 500g pack of McVities Digestives is 50p, 45g Kit Kat 'Dark' 25p., Nestle walnut whip, 6 for £1-00 300g Tesco British steak, very lean & tender, £2-40, Waitrose British pork chops, not a lot of bone or fat, various wieghts from 200 g to 600g, half marked price. When they get very close to the use by date they go on special offer at ANY 4 for £1-00, so then I sort through for the best highest weight ones. They are in the chilled section and can be frozen. I'm stocking up a bit with soups for winter, Heinz 400g classic vegetable / chicken & mushroom 4 tins for £1-00 ( BBE 06 / 2015, Heinz 400g muligatawny, 6 for £1-00. Maximum per customer per visit is usually 6 of any one item. Usually I get half a trolley full of various stuff for about £20 and share it with family and close friends. I can, and sometimes do, take a 'guest shopper' with me and they have the same 'allowance' for themself. With those prices I've no desire to shop anywhere else. If you are in N.E. Lincs. and would like to go as a guest, CM me.
Yeh I know I'm deprived, such a low class area in the Midlands! There's a Waitrose at the M6 services which means it isn't of much use to me and I guess would be limited in size/scope. But I can always use Ocado. 
