Just my two cents.

Freddie's foster mom has many other cats. It's not her fault, but she never really noticed Freddie's litterbox habits because of the other kitties.

You would be able to give him one-on-one love and care. You'll develop more of a bond, so when Freddie leaves it might be harder for you. But he will have been loved by his very own person.

Let's hope he fools the vet and lives even longer than predicted.

{{{hugs}}}

There are others here who have gone through this, and a couple of them know some really good websites.

I found a couple. There's good info out there.

http://www.felinecrf.com/

http://www.felinecrf.org/

I wanted to add this quote from a page on the second site:


http://www.felinecrf.org/how_bad_is_it.htm
You may well panic if your vet tells you that your cat has lost two thirds or more of his/her kidney function. I regularly hear from people who say things like "my vet told me my cat has lost 75% of kidney function and it's looking really bad".
Take a deep breath. It is probably not as awful as you fear because it is actually normal for CKD not to be diagnosed until a cat has lost at least 66% of kidney function. The What Happens in CKD? page has more information on why this is the case.

What you need to focus on is the fact that cats with CKD can often manage quite well on limited kidney function - for some cats, things only become critical when they have lost as much as 90% of function, and there are some cats who cope astonishingly well with even less function. So the goal is, not to worry about the function that has already been lost, but to try to help your cat manage with whatever function remains for as long as possible.