Urgent: Senior Rooster (4yo) Wobbly & Blind - Seeking Advice (Puerto Rico for vacation)

I am in vacation in pr and found this rooster in my grandpas backyard who seems to be very sick. He’s a blind, 4 year old rooster. I don’t know anything about backyard chickens so i came here for help. I figured he’s on his last weeks maybe and i wanted to give me a better life because he wasn’t living in good conditions. He’s blind, 4 years old, and very wobbly, and often falls when he tries walking. i put him in a small cage and with soft ground so he doesn’t hurt himself. I’ve been tapping his food and water so he can find it. Despite being weak and thin, he is still fighting—he is drinking water constantly and eating a bit, and while his head sometimes falls over from exhaustion, he "snaps" it back up and stays aware.