Well, you know, I've been homeless and poor. I've spent most of my adult life unemployed. I lost everything I owned.
I had to learn adulting under duress. Many poor people don't know (or they fear) basic things like how to prepare meals, wash clothes, pay bills, clean the house. Many people choose the freedom of homelessness over the burdens of operating a household.
SNAP is a supplement, of course, and totally unnecessary even if you're dirt-poor. You can get by on food boxes and other donated food, free meals in parks and at churches, etc. SNAP does have a lot of hurdles in place.
Once again, there's no poverty in these United States for those who are determined and not overly impaired. Perhaps we're into "No True Scotsman" territory but I wouldn't even label as poverty someone's life in a shelter, where they can access 3 squares a day and comfortable hygienic bathroom facilities and usually a spot to try and land a job and increase their opportunity.
I've seen poor people living in garbage, like literally they scour garbage pits and they live among them. Poor people with children who have distended bellies and they're stretching bowls full of rice with dirty water because there's just nothing else to be had. Abject poverty such as that is just unheard of in our borders, because there's too much subsidy and programs and infrastructure that exists.