Very basic. Enough to get you started. You may need to plan for a camping-style pottie/toilet and maybe a way to cook food. Some folks get real fancy and place solar panels on the roof that feed into storage batteries designed just to provide electricity to items in your living space. There are Web sites and videos to assist you with that technical stuff. Folks such as I lacking technical skills and the money to buy the fancy stuff have to make do with the basics.
Do not be homeless
Alternative Living Options 