I've been wrapped up in a bunch of stuff here for the past few days.
I use the dollar general diapers and they seem to hold quite a bit of pee.
It's my understanding that what kills most incontinent pets is urinary tract infections and kidney failure, which is why it's critical to keep a weather eye on their urine output. At this point I can smell an infection most times, and every time I see urine now my brain automatically processes "color, cloudy or not, smell" without my even thinking about it. Butterbean is now six as is Black Cherry. I hope to have them a long time. Certainly there have been times when I came clsoe to losing them, like when his liver crashed, but we managed to pull them back with some intensive care. So I think the big thing is to watch every little detail, know all the signs of something going amiss and catch it as soon as you suspect it. I can actually look at Bean and do a quick evaluation from his shape. His bladder makes a bulge on his right side if it is getting full, his colon makes a bulge on his left side (he is not put together correctly, whoever was on the assembly line that day didn't know how to assemble kittens well) and depending on teh size of the bulge I know if he is getting into slow gut problems. I can look at his back and tell if he is dehydrated by how much his spine is defined. If tehre is anything of a ridge, and esp if the fur is starting to stick up at all, i know he needs fluids. I've seen him go from just a ltitle dehyrated to massively dehydrated in a very short time, so I hop on it immediately. When his gut is slow, he will get dehydrated.
I hope he lives a good long kitty life, as well as Cherry. She isn't as complicated thankfully.