We have a rescued cat (just realized I forgot to put him in my siggy

) that has lived with us for almost a year, from kittenhood to now. He used to drink his own water. Now he goes downstairs, eats his food, comes up, and drinks Sasha's water. I even bought him little bowls that look like hers. No help. He's determined to drink hers. I donno what to do about it, I've tried shutting him downstairs and he refuses to drink his water. He just sniffs it and then drinks hers. Well, Sasha needs her water darnit!