Two adults, two young kids and we spent €11,440 in 2020 in grocery stores, so €220 a week. That figure includes a limited amount of alcohol. All spend is tracked and includes misc. items in convenience stores, trips to M&S etc.
When I had to, when money was tight, I would quite easily get out of Lidl for €80 a week for a family of one adult and 4 children. That includes toiletries etc.
I now spend a net €160 a week in Dunnes (after the 20% off vouchers).
That doesn't include alcohol. I don't drink much but have expensive taste; wine under €15 a bottle is strictly for cooking, whiskey (the "e" is important) needs to be 18 years old and beers need to be of the Craft variety.
Family of 2 adults and 3 kids (under 10 yrs)....averages approx €230 per week over course of a year. Includes most toiletries, cleaning products and some very limited alcohol (2 bottles beer per week). Mix of Lidl and an overpriced SV shop.
There is no right answer to this question, if I had to, and when I had to, I could live frugally (spaghetti hoops on toast being a dinner !) . I consider food one of the joys of life and I haven't a notion of living frugally. The older I get and particularly due to Covid that is my view. Our actual food bill is higher due to Covid but we are saving a fortune on dining out. And we dined out very well indeed.
Maybe a better question should be how much can I get the food bill down to, for those needing to do so. Without feeling like the family are hard done by.