Tailoring diets usually happen when there is a health issue involved. Since you didn’t mention one – I assume this is not the case. There are general guidelines you can find online for creating a raw diet for a cat – and once you understand the basics you can tailor it to what the cat likes and dislikes. Other than going raw (raw meaty bones and raw meat) I don’t understand how you would ‘tailor’ a diet to an individual cat.
Learn more about a biologically appropriate diet for a cat by googling that, also BARF diets for cats, raw diets for cats, etc. And start reading a lot of books on the subject. I have been feeding raw to my dogs since the 90’s and I am still reading and learning about canine nutrition – every years that passes gives produces more information, better understandings of what our pets need to be happy and healthy.
Good luck.
I have seen some cats go quiet and some purr. It is, as with all things cats, to each their own.
I do think that all animals are far more intelligent, intuitive and superior than we humans give them credit for,, especially when it comes to death (and life).