UTIs can differ depending on where in the urinary tract the infection is.
Kidney (Renal) disease can be either chronic (long-term) or acute (short-term) and there may be either disease or the process of failure. Here's a website that lists symptoms...
First thing I would consider is the litter box itself: Is it cleaned out regularly? Cats may reject using a soiled litter box. Has it been moved recently? Cats are creatures of habit and it may take some time for them to get used to the new location for the box.
Then, not to scare you...
I'm with you Zoneout. I make raw food at home and source all the ingredients myself. I've been feeding raw muscle and organ meat with supplements to my cats for over 15 years and have had no problems whatsoever. Not only are their stools more compact with less odor, but health issues have...