ok, sad I know, but I keep a spreadhseet of all the spending in my household and have done so for a number of years.
2 adults, 2 young children...currently running at €175 per month in 2013 for food/toiletries and that includes nappies etc.
It was running at €135 before #2 came along last year.
We cook everything from scratch, all as healthy as possible. Occasional piazza but with home made oven chips. Make enough on Sat to cover Monday, enough on Sunday to cover another dinner mid-week.
Make soups etc from scratch also.
Hit the main supermarkets on a Sat morning with lists made out of what's on special and where. But lots of fruit and fresh veg in lidl/aldi and occasionaly tesco/dunnes, depending on the offers.
Kids eat the same meals as the adults, and there's no exceptions. Ok, you quickly learn what they won't eat under any circumstances i.e. broccoli, and so you don't serve that to them. If they don't eat, they don't get the occasional treats or to watch a small bit of TV that evening.
Both adults work, very busy jobs too. So it's hard to look after all and keep the show on the road, but it's possible especially if you want your kids to eat well.
No sugary juice drinks, absolutely no fizzy drinks.....I don't understand any parent giving that stuff to a young child or arguing that it's cheaper to give them chocolate bars v's chopped fruit mixed with youghurt for example.
No expert at cooking but know the basics and love to try new recipies from various books. If there's a real will, there's a way