Abandon this project immediately. Use whatever personal resource (time, energy, motivation) you’ve got left to find any sort of technical/intellectual work that leverages your most valuable skills before it’s too late.
> “I merely exist here, as it is difficult to get any useful computer work done.”
Eventually you will find it impossible to do anything with those most valuable skills.
The people who made it listened, observed real problems, and crafted something obviously useful and better to fill a specific category of need, most often while working another job to pay the bills.
Survive, thrive, and then work on side-projects. Side projects are too risky to become an immediate living when you need water, food, and shelter.
Honestly, I avoided shelters because of the lack of safety and risk of diseases like TB, c. auris, meningitis, bed bugs, and such. Yuck. I'd rather find somewhere quiet hidden away.
I see others have tried to help in the past with little luck, but I'll take a stab at it too, just in case: I'd focus on getting some income of any sort coming in, even of the informal employment variety. Also, go to your local social services office and apply for things like EBT. Once you have a few 100 dollars (which you might even be able to get by panhandling for a few days), go find a room for rent. If you're not picky, you can get one for $100/wk or probably even lower if you look around. Then look for more sustainable income sources. Once that's all sorted out, only then start thinking about your side project.