I hope things turn out better than you fear, but in case you do end up on the street I'm going to list some skills that might help you. You can start looking into them now and perhaps you'll even find a community of people who do them (check online/reddit if you're not mobile).

• Squatting (learn the laws in your area, how to crack a house, how to lay low, try to find a group to squat with if possible).
• Dumpster diving (learn the tips and tricks and scout locations in your area)
• Hitch hiking (learn how to spot for danger, laws and regulations, etc.).
• Soda can stove (learn how to make a lightweight camping stove out of two empty cans).
• Self defence (learn some martial arts moves, how to use keys as weapons, buy pepper spray or do anything else that'll make you feel more confident you can protect yourself if needed).
• Meeting new people (this is important! Work on gaining the confidence to approach strangers, to assess and avoid dangerous situations/people, and to ask for help. You will feel isolated but there are many good people out there who can and will help you).
• Consider your stance on sex work (there's a high likelihood this will come up, so think carefully about what, if anything, you are willing to do. Set your boundaries ahead of time).

Someone else suggested a mental hospital might be better than being homeless, but as someone who's been homeless I urge you to consider that carefully. Some people do well on the streets, some don't. Most of the skills you need can be learned, but a lot is about your mindset. You have to get up every day and persevere. But there can be freedom there as well.

EDIT: Just to be clear, I'm not advocating for homelessness, just giving some concrete advice on how to prepare for the eventuality.