You can try putting the food thru the blender mixed with some water and slowly feeding by using a small syringe. After feeding Watch for signs that he has to use the litter box. Remove cover, if there is one and carry the cat to the box. Support the cat. Most important consult with your vet. They may recommend a steriod treatment to reduce inflamation.
Thats more of a consult your vet thing.
Thanks! Your answer is awaiting moderation.