Caring for a Blind Kitten?

I have taken in a 15 week old kitten who is completely blind. After having a rough start in a home that clearly had done no research had left him traumatised and feral in behaviour. He came to me untrained, untouchable, and with rear leg trauma. I have him crated, and he comes out for exercise, and socialising several times a day in short bursts when it's just me home and it's quiet. I keep being told he is the same as a seeing cat and that he will find his litter box, etc. yet this is proving a huge task. He also chews the side of the bowl when eating, constantly chews the china, then eats food, then chews the door frame, or any other object that's near him.

He eats like he is never fed, so I have split him onto four meals a day, evenly spread with cat milk mixed water (as he will not drink water alone) which I also had to assist (teach) how to lap, as he stuck his face in and sniffed it up, so he was dehydrated and afraid to drink. So basically I am concerned that he has suffered more harm, and maybe is mentally unwell too? If I can email videos to someone that would really help. I know it's early days. But I am covered in scratches and feel like I'm getting no where.

By Kay