I have not tried adding the egg yolk, but I did try adding the brewer's yeast to the water. He seems to go through it faster than the pure water I'd give him.
I do not have the money for poultry vitamins. I'm unemployed and am able to get the household food once a month. =[ I tried looking for the vitamins that would be in it, though, but couldn't really find much on it. What's in it, exactly? I might be able to whip something up in the kitchen. as for the baths, I try too often, but he doesn't really swim... he just floats.
UPDATE:
Well, it's day two of the brewer's yeast. He has grown a little, and I thought his leg was looking a bit better, until I took him out for a bit. I put him down in the kitchen (linoleum) and he had a really hard time standing up. So I grabbed his towel and laid it on the ground. I then picked him up and went to put him down and he started to FREAK OUT.
He tried running away but kept slipping everywhere. I picked him up again and then he would just cuddle up against me. Every time I attempted to put him down, he'd freak out running away (from me or whatever else that was in his way.) So I picked him up again and just held him for a bit. Finally, I was able to put him down again. After that though, I noticed he is breathing by opening and closing his mouth and his eyes are extremely dialated.
We took him outside for a bit and I recorded a video of him to show the breathing and the new limp he has. The breathing is more visible than the limp.