Karen, I think it's all trial and error. I know they want you to keep swallowing but he can probably only manage smoothies, cream of wheat, yogurts at this point. if he does chicken he will need a sauce on it or it will get stuck in there. I think I pureed chicken pie in my Magic Bullet and he ate that for a few weeks. I ate it too. It looks awful but it tasted good ( he couldn't taste it though) My husband still caN'T TASTe much after a year and this greatly impacts his eating. he can taste sweets so he eats chocolate all day.
Even if he can just drink water/juices right now, that will keep his muscles working.
Good luck, it never ends does it?