I also give my cats filtered water but they seem to want plain old tap water. Every time I use the kitechen or bathroom sink, Rory jumps in and tries to lick up the water.Now I fill some of their water bowls with tap water and yes they do drink from them. Even if there's plenty of water in their bowls, I do dump out the water every morning, clean the water bowls, and then fill them up with fresh water. I tried water fountains in the past and some would use it and some wouldn't. Then my RB Sunny decided to play in it and there was water every where. I've noticed that Rory and Radar like to play in the water so I won't be trying out any more fountains any time soon.
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