"Real couponers" may be able to live off $30 a week or less, but yes if they are buying all processed food -- they might be coming to see me for some expensive medical bills when I get done school.
We're down to about $50 per week for 2 people, covering groceries and toiletries. Without spending a lot of hours on coupon stuff. I can't really see doing too much better without sacrificing the amount of fruits/veggies I eat.
You say you are spending $70-100 per week. Truthfully if I had kids, I have no idea how I could get that any lower.