Sombody I know set up three dishes of water for her cats: one had water filtered by a Brita, one had plain tap water, and one had bottled water (I forget which brand). The cats always went for the Brita water.

Does this mean anything? I don't know.

Another thing I heard years ago: Cats that hear the sound of cats, and other animals, on vinyl records, played on analog audio equipment, respond like it's "real" - but don't pay any attention to CD's with the same recordings.