Any pigeon people on line?I brought home an injured teen-aged pigeon yesterday. He drank a lot of water this?

morning-good, I have seen him fully extend both wings, his feet seem all in one piece. He is almost fully grown, but still just makes the squeaks instead of coos. He doesn't seem to be eating much of his bird seed. What should I feed him? (He is pooping). I was hoping to let him heal a few days and then release him in his neighborhood. I feel guilty over the last pigeon I brought home because I dropped him off at a rehab and I know they did not return him to his neighborhood. He is in a big box in my kitchen. Any suggestions would be much appreciated. I know the little feller must be scared, but he seemed to trust me more after he had a long drink of water this a.m. Help.