Our cat is exactly the same Howard.Fresh water and milk but she will usually go round the side of the house and drink water from an old bucket with algy and things swimming around in it.I,m sure the cats know something we dont,perhaps it has some sort of health giving properties,who knows?
Something to do with it being rainwater I am told Andy. First noticed it when she had a litter under my stairs, wasn't even my cat then!! She decided to go out and leave me in charge of the "mice" she had given birth to and drank some muck.
We no longer have their drinking water inside as they never used it even when it was raining instead we now keep a large bowl of rainwater outside.
-----------------------------------------------------------------------
I try to be neutral and polite but it is hard and getting even more difficult at times.
-------------------------------------------------------------------