Apple Cider Vinegar for Cats

Today is my first day using Apple Cider Vinegar for my cats one has third eye and the other two have issues going to the litter box I made ice cubes of Apple Cider Vinegar I made a 1 cup of water 1 spoon of Apple Cider Vinegar my cats likes ice cubes in their water so I figured let me try it this way and she was drinking and licking the cubes. Fingers crossed.