Groceries and dining out combined (including coffees, drinks, random pastries and other treats here and there) has come out to $21.73/day for the period from the beginning of this year to the end of September, which I see makes me a real spendy-pants in this thread. Not being such a tightwad about dining out has been one of my major forms of lifestyle inflation since I began earning a real income, and it brings me a lot of convenience and happiness. My family rarely dined out when I was growing up, so it feels like a real luxury to me. I stick to relatively cheap (by SF standards) fast-casual kinda food, very rarely do I go to a fancy sit-down restaurant.
Living with roommates, I don't have a lot of space to store ingredients, and I don't enjoy cooking for just myself anyway. So I buy lots of convenience foods (bags of salad, ravioli, frozen pizza, etc.), and I don't stress about eating out a few times a week. By grocery shopping minimally for just a few meals at a time and not buying a lot of ingredients to cook with, I essentially never have food waste. I might spend less money cooking more at home and throwing some wilted veggies out here and there, but it would still bother me.
I get a free lunch almost every Saturday and Sunday after volunteering in the mornings, so I usually try to run out of perishable food around Friday, and shop again on Monday.
Imagining my ideal lifestyle, I imagine this number will continue to go up, not down.