Tough to say. Probably $8.00 but we can and raise all of our vegetables and meat. So if you figure electric or gas to cook or the sweat that goes into it- it's tough to say. Some days we feel like we eat for free. Right now we have asparagus breakfast and dinner. We have a lot of spring onions now so onions and asparagus omelets for breakfast. My wife makes bread. We buy coffee like other people. Lunch has been deer jerky, our own salads, home made soups, Dinner has chicken and asparagus and potatoes lately. Steaks and stews are pretty cheap for us. Out grocery bill is usually $30.00 a week and it's only for things light flour, sugar, yeast, beans, coffee, fresh fruit, ect. Things we do not have or do not make.
You can save lot buying meat that is ready to expire at the meat counter as mentioned above.

If you have land it pays to raise your own pork, chicken, or beef.

40 bucks a week I keep cost down by forgeting why i'm in the store

Absolutely no idea. I raise all of our meat along with quite a bit extra that gets sold. With the exception of lunch meat and some occasional seafood. We also grow some of our own vegetables but not a meaningful amount. We do eat out more than we should, although shutdowns got us out of that habit somewhat.

I don't drink or use tobacco so that helps.

Don't know, can't live without eating. Plenty of food from the grocery store, fish and wild game, canned and frozen veggies from the garden. If I thought I was spending too much on food maybe I'd keep track. Only me and the Mrs and the great granddaughter some weekends. Had a budget when raising the kids but not now. Don't eat beef much. Chicken and pork from the store aren't that expensive. Don't eat out but once every two months. Probably cost more to go to the grocery store in gas than the food bill lol