Rat Exclusion

RATS: What is the best method for making sure a rat doesn’t come back. I’ve been seeing peppermint oil, steel wool and caulking? I’ve also been reading to keep pet food and water dishes away. I have a cat. The food being put away is ok.. but the water dish would be bad for my cats health. I’m worried he wouldn’t be drinking enough water and get a urinary tract infection. An exterminator was in my apartment, but didn’t find any structural damage. The rat got in somehow, so apparently now I have to find it myself. Any help would be very appreciated.

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