awner81, I'm rated 100 percent disabled, I say that because only you understand your disabilities completely. That's the way it is for me, and suspect as much you may try to explain what you have going on, no one can completely understand.
So this is just an idea, because I don't pretend to know what will work for you. For example I have mild post traumatic stress, and it's hard for me just to be in a Walmart. But, have you considered going without a car? I know many on this form, if not most will disagree with me when I say I don't think on $700 a month you can afford a car. Yes, people have presented budgets on $500 a month. But the first time you break down your paying a shop $120 per hour plus parts for repairs, and this is after insurance, gas, and maintenance. Emergency fund if you have one will evaporate. Then it becomes a race to save up for the next emergency on (let's face it) a very well used car.
When I became disabled I gave my small SUV away. Could you ride the train, or bus? In my case I would try to get a passport and passport card (as a backup) because it does require an address on the ID, and this is a valid government picture ID. Valid for ten years. But if all you have is DL at your aunts address that would work too for a while. With a backpack and a change of cloths you could travel the rails via Amtrak. When you get enough of that you could backpack Europe. It wouldn't take much money to add a compact sleeping bag, a bevy and a hammock. I have all this that fits inside a normal backpack, book bag type size. I have a very good walker that can help me carry the backpack and gives me a place to rest (sit) for $89,,, with wheels. My cloths are synthetic fabric and can be washed out in any bathroom sink and be dry in a hour. One thing you won't see how to do much is waiting... yes waiting. sometimes when you arrive at a terminal (bus, train, or air) it may be the middle of the night, or just during the day and you may need to rest before you move on. Place your ticket stub in your front pocket, sticking out enough to see, grab a chair and take a nap. Security will see the ticket stub and most likely leave you alone. If they do ask what your doing, you honestly tell them what you came in on and then tell them your waiting for your ride.
Which brings me to having a smart phone. You won't find the kind of stuff you need if you want to try this at Walmart. You'll need a smart phone to locate someplace like an Academy Sporting Goods on your fist trip (or order on line). Also the smart phone with Google satellite and street view, you can find places to sleep. I once spent a month off the 101 in San Jose, CA. I had dinner, wash a dish, brushed my teeth, sponge bath, and wash my hair each day on liter of water. But I can tell you after a month, your ants house would look pretty good.
My setup includes a USB solar charger and USB battery backup so I would have power where ever I was. All fits in my book bag style backpack, so I don't appear to be a typical homeless person.
If I was in better shape I would considered permanently hiking/camping the Pacific Crest Trail, but I'm too disabled for that.
Only you know if this; or parts would work for you. But if what you really want is a car, it of course won't work. Be honest with yourself and do a budget.
Finally I get it in East Texas. It was there that Christians, through their actions and words, that convinced me that God was a myth and does not exists.