This is something I went through with Korky when he was in the early stages of CRF.
Does Bass go out? You may find she prefers to drink outside, in fact she may already be drinking from dirty puddles
( a favourite with a lot of cats).
I tried a water fountain to no avail (even got on my knees to lick it myself to show him what to do
). I then found out that cats are very sensitive to both the position of their water bowl (many don't like it next to their food bowl just to make life difficult for you) and also the type of bowl. Some cats prefer short fat bowls, others tall slim bowls or even glasses, some patterened bowls, others plain bowls etc etc. Its a matter of trial and error I'm afraid. I had bowls everywhere (including outdoors) and eventually I found a pyrex bowl in a different room from the food bowl was Korky's favourite. But be warned - some cats just don't like to drink and if Bass is one of them and you think she is a bit dehydrated you might have to stick to wet food (another thing I did with Korky).
beaten to it again I see- I'm such a slow typist.