I bought one of these a few months ago for Martha, but she ignored it & I couldn't stand the noise
(it's now packed away for the next Purrs auction!)
She's in the final stage of CRF, but I have only seen her drink once or twice - and that was only after being sick. So I add water to every meal now (except when she has her thyroid tablet), and she usually gets fed about 10/12 times a day (4 of these before 7.00am
)