“My food budget is $100 per person per month. “
So your food budget is about half of the SNAP benefits for a person who gets the maximum benefit.
I think SNAP tops out at $180 each, based on an online calculator I looked up during a discussion about welfare bennies. But my budget is $100 each, including snacks, ice cream, milk and so on. But I seldom buy things that aren't on sale, so my prices are actually lower than in the example I quoted. And I go to dollar stores for things that are near or just past expiration. People who are eligible for food stamps can also go to food pantries, where they can get significant amounts of food to supplement their Federal bennies.
For a family of four, the max benefit would be about $200/week. I feed my middle-class family well, and I doubt I spend much more than that on food, on average. Of course, I buy lots of fresh produce, chicken, meat, and seafood, and we cook it, rather than buying a lot of pre-packaged microwavable crap.