I have 4. I will not leave them, no matter what the cost to myself. I would be able to get them into my car (in carriers) along with their bag of food, but have no clue as to where I would go (where I could go with my cats). I will not leave them in a shelter because they would be terrified. Fortunately, although my car is old, it's a large SUV. I guess I would drive until I reached a store where I could buy litter box items and bowls for their food and water. I'd put it all inside of my car. Then drive somewhere and just park until I figured out the next step - perhaps begging relatives for the $ to stay in a motel. OR actually go to a relative and just say, "Here we are, you have to take us in."
It would be extremely challenging, but somehow my cats and I would survive.