I’m now trying to think if I can get him to the vet (as they won’t treat an animal they haven’t seen). But I don’t want to risk sending him to the shelter which would be the outcome.
And the public water is probably infecting any other cat that drinks but there’s not much I can do without overextending myself ie. getting rid of the dispenser and washing an outside bowl daily (without wanting to bring an infectious item inside so I can use hot soapy water)