I haven't seen it in the fountain at any of the resorts we've stayed at, though we've never been at CSR. I believe your answer will be no. I wish it was available at all resorts at the fountain because that's my DH's beverage of choice at home.
I've seen Sprite, Fanta Orange, and Minutemaid Light Lemonade at the mug station at CSR. Not seen soda water in any of the resorts at the refill stations.
I got a chuckle out of this because my dh is from Texas and the phrase "soda water" to him means Pepsi or any other brand of "pop". He makes fun of the word "pop" which is what I used to say, being from Ohio. I realized you meant "club soda" the clear, fizzy water my folks used as a mixer in drinks.
As the other posters said there is not any soda water in the fountains. Besides the suggestions already made, I know there is iced tea, but I do not recall if there was a decaf iced tea.
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