About $5 per person per day for 2 adults, for groceries. And we do NOT cook hardly at all. We survive on fresh fruits/veggies/salads, cheese, fancy deli meat & bread, nuts, yogurt, and some convenience stuff (canned soup, ind. microwave rice bags, boxed cereal, etc). Just realized a whole $1 of this is my energy drink habit! :(
It's another $8 per person per day (so $13 total) on eating out. We get 'fast casual' or take-out 2-3 times a week, usually local Indian, Korean, Mediterranean, etc. We go out for a true sit-down dinner (usually social with work people or for a birthday/anniversary/etc celebration) about once a month.
I find our food costs atrocious every time I see them, but I've tried cooking more, shopping cheaper ingredients, etc and we just seem to throw food away and eat out more, which is even worse! I've had some luck finding some things cheaper at our local Walmart. They seem to be stocking "up" to compete with a new Whole Foods, and now have the fancy yogurt and sparkling water we like for half the price. Maybe try doing a price book of your staples at different stores? I tend to go to Walmart one week for staples and the fancy grocery store the next week for produce, meat, and cheese only.