We bought a water fountain and now nobody drinks from the glass
For years Pirozhok drank only from my water glass, preferably at night, preferably the one on the bedside table. The vet suggested he might just like moving water, so we got a small fountain with a pump and a filter.
Week one
Suspicion. Mysh sniffed it, sneezed, and walked away. Pirozhok batted the stream with a paw for ten minutes, licked the paw, and went back to my glass.
Week three
Total conversion. Both of them drink from it several times a day, and the glass on the bedside table is finally mine again. The only downside is that the pump hum is now part of the flat, and I notice when it stops.
Practical notes
Rinse it every few days and change the filter monthly, or it gets slimy quickly in summer. A ceramic one is easier to clean than plastic. Put it away from the food bowl: both cats ignored it until I moved it to the other side of the kitchen.