500-600CAD, so 350-430USD, at current exchange rates. We're a family of 3 (2 adults and a toddler), plus cat, and we enjoy making relatively elaborate food and cocktails and throwing dinner parties, which we manage on that budget.
We're in Quebec, so a few things in our budget are higher than in the US (a gallon of milk cannot be sold for under 6.40$ and toddlers go through a gallon in like 3 days, and a bottle of booze - the cheap swill vodka, mind, not good booze - can't be found for under 22$, with cheap iffy wine starting at 8-9$ per bottle). However, because we shop sales, have a freezer, and make most things from scratch, we usually come in on or under budget.