If your opinion how much money do you think a family of 6

Depends on where your, eating habits, and what you like..
And how old the kids are I know teenagers can eat alot. I'm thinking right around $150.00 to $200.00 a week..

We're a family of 6 and I spend around $200-$250 a week. I have two teens who are always hungry, so that factors in.

We could probably eat cheaper, but I feel like the food quality suffers when we do.
I avoid processed foods for the most part and we eat a mostly whole food diet, choosing organic and non-GMO whenever possible. It's not cheap to eat that way. I buy in bulk and make most of our meals from scratch, so that helps cut costs a little.

Depends on a number of things, can they grow a veggie garden? Do they mostly eat prepackaged or processed food. Do they live in the country, in a city. Do they have access to a farmers market or coop.

should spend? Or needing a minimum requirement? Depends on what the family can afford

Depends entirely on the people in that family...

Around $250 a week