I tried the Rescue Remedy and ti didn't seem to do anything for my guys (maybe I didn't use it for long enough )

I am not sure of the medicine you are talking about to test a cat's urine, but I do know that there is a product available in PetSmart that can help determine if your cat has a UTI. It is kept in the litter department and is a small box of litter with some chemical in it and when the cat pees in the litter, if it changes colour then the cat has an infection. With multiple cats you would have to confine them to solitary confinment so that only one at a time would use the special litter.

Good luck and sorry that it was't Pouncer