My Drinkwell also has the reservoir (sp?) option. I only tear it down and scrub the components completely once a month or so. I do top off the bowl about every other day and refill the reservoir a little more often than once a week. It sounds odd, but Cassy and Livvy seem to avoid it when it's been freshly cleaned... which is why I've cut back to my current schedule. (No, I don't use soap, just brushes, water, and elbow grease.)

(At least once a summer someone tries to go swimming/playing whatever in there and that requires a major cleaning up job.)

Some cats adore having ice cubes floating in there. Mine seem to find them nuisances. Oh well!