The water is fine, I always notice when it tastes weird (DBF compares me to the daughter in Signs LOL) but the water at restaurants in DL/DCA is always fine.
I have to disagree with others - I don't care for it. I find that everywhere I have been in So Cal. has bad tasting water. It's not undrinkable, just not enjoyable. And the bottled water (Dasani, is it?) is no better. JMO.
I super dislike most bottled waters. HATE Dasani. Too sweet. The water in California tastes fine to me as long as it's cold. It's not as good as my yummy Utah water But it's drinkable..and WAY better than Dasani. Bleh. Sounds like it's up to the person LOL. May as well give it a shot and if you dislike it either bring your own or get the Dasani if you like Dasani
I agree, the water at restaurants, even counter service places and at the hotels taste fine (and I'm pretty picky) and normally don't drink So. Cal water, but the water fountains I tasted were nasty! Although I have heard there are several in the park that have filtered water. I tried the one in the first aid station.
Since you have so many WDW visits on your sig line let me just say that California tap water tastes waaaaay better than Florida tap water. DLR water is just fine.