I've had quite a few UTI issues with my cats. Luckily they are all in the past. We were put on Walthams but i was not happy with that at all as i was used to feeding them felidae... So i did a lot of reading and came up with some alternatives to Walthams which did the trick.
Please do check with your vet before trying any of the following suggestions:
1. Liquid cranberry extract.
Make sure you get a sugar free variety. The dosage is 250mg a day for cats.
This should keep the urinary tract acidic.
2. Feed once a day
Feeding your cat once a day allows the body to revert to it's natural state which is acidic. Free feeding means that the cats body never fully reaches the state of acidity that would normally keep UTI infections at bay.
3. UTI Supplements.
There are food supplements that you can buy which also acidify the cats system.
General products for urinary health.http://www.onlynaturalpet.com/Natura...blems_s/88.htm
Check out the cranberry extracts and the urinary support products.
If you're feeding a dry food your cat may not be getting a lot of water. It might be a good idea to give your cat some wet food and add some water to that as well.
5. PH sticks and home testing.
You can also get a bunch of ph stick or ph papers from your vet OR that site that i have given you above. This allows you to periodically test your cats urine. All you need to do is collect a small amount and use the stick to check to see if your cats urine is acidic enough. Once a week should be fine...
If your worried about HOW on earth to collect a sample it's pretty simple. You just need to wait till your cat goes and insert a small pie tin between it's legs from behind... You may need to bend the pie tin a little so that it's a little narrower then normal. Once they start going they rarely ever stop half way. You won't need much for the ph test anyway.
I can't recall what the ph is supposed to be but i'm sure your vet will be able to tell you that over the phone