Homemade recipe for different situations?

[rjesak]

I would very much like to start adding at least some homemade food into my cats diets. I've found some recipes, but I'd like to find one recipe that will serve all my cats without exacerbating any of their issues.

Here's what I've got:
Zander - overweight but has been losing since I put him on an all wet food diet.
Oscar - low immunity because of his advanced asthma. My holistic vet says that I should not give him raw food because of this.
Jessie - recently diagnosed as diabetic.
Gus - chronic urinary tract infections. He gets a new one every few months. He's improved since switching to wet food but he still gets them fairly often. He also gets upper respiratory infections - probably two or three a year. He had one when I got him (at about a year old) and the vet said he probably would continue to get them - he has. Don't know if his diet plays a part in this.

So, is there a basic poultry-based recipe that I could give ALL the cats?
I know there's the stuff from feline future - would that be good for all of them?
Is there a simple recipe I could make without the feline future stuff?