Never totted up what my food spend is. Usually spend $10 to $15 a week eating out.
Maybe four visits a week to the supermarket @ $15 average, but that will include household stuff. I like to get bread, fruit and veg as fresh as possible.
So, say, $350 per month max.
Luckily, at the moment, I have a surplus of income over outgoings so I don't budget. What Brexit will bring is another matter . . .