I spend anywhere from $50.00 to $80.00 a week on groceries (family of 4). That includes diapers. Sometimes I even just spend $20.00 a week on fresh veggies and fruits. I cook almost exclusively from scratch and that helps. I stock up on 10 for $10.00 items like peanut butter or spaghetti sauce. I also stock up on flour, sugar, crackers, cereal, etc when it is a great deal. I grow and can/freeze from my own garden and local farmers market. I buy my laundry detergent, fabric softener, toilet paper, paper towel, chocolate chips, baking cocoa, butter, OJ, spices, yeast, and real vanilla only from Sam's club (those items tend to be cheaper than if they were on sale at the grocery store). I usually only buy what's on sale and make a list and stick very close to that list. Occasionally use coupons -- could be better about it, though. Rarely buy prepackaged food. I am not afraid to buy store brands. We eat leftovers around here. We generally buy our meat through local farmers -- roughly about $2.00 a pound any cut. Just a few ideas of what we do around here.
And I'm with Chickentoes -- I use white vinegar to clean and mop. At Sam's Club you can buy two big jugs for the cost of one big jug at the local grocery store.