Thank you for replying, BJM!!!
He refuses to eat Friskies, LOL! I have him on Fancy Feast pate right now, he loves that. He's lost a lot of weight from not eating the Friskies, so I'm trying to get him SOMETHING he will actually eat. He was on 97% high protein wet food (Natural Balance, Nature's Variety Instinct, Merrick's) until shortly after I lost my job last year. 97% because he still gets crunchies on top. He had a partial UT blockage 4 years ago, and has been on wet food since.
I have added water to his wet food since then, because he wouldn't drink water on his own. The past 2 months or so, he's started drinking water anywhere he can find it. He has a bowl next to his food, and a plastic cup in the living room so he doesn't drink out of mine. More water - more urinating. But it was the suddenly drinking water often that made me think diabetes.
If he has food he likes, he eats like a pig. If he doesn't like it, he'll just drink the juice. He's eating great since I switched to the Fancy Feast. Like a pig, LOL!
I'll look around more for ways to test him. Insulin, I have to go to the vet for, and I have no income right now. Which is why I was wondering about the veterinary assistance. I have a GoFundMe for him, but not getting much. And I want to be sure if it's diabetes, and not other things like you have mentioned.
Lovely orange tabby! Love the orange kittehs!!!