A friend of mine a couple of years ago said that his wife budgeted $50/week for groceries and she never went over that. At the time I was thoroughly impressed and wondered if that was even possible (though to be honest, they consistently ate much better than we did, she was a SAHM and cooked all of their meals and we were DINKs who ate out quite a bit - $50/meal was not uncommon).
So in an effort to be prove my frugality, I have decided to take up the challenge and try that myself. I have done it for the last two weeks without a problem (except for when we went out to eat on Friday night). However, I have my freezer and pantry pretty well stocked from less frugal days. The real challenge will be to see if I actually will be able to buy my refills from costco within that budget.
In order to accomplish this, I pulled out a separate wallet to keep the grocery money in and I am only going to deal in cash - $50/week. So far, the only trick is to actually plan our meals and make them. When I actually do plan a menu, we eat so much better, so this may actually be better eats for less money.
If anyone else is feeling up for a challenge, try $50/week for food and let me know how it goes.