Yes, they will. Most people don't buy bottled water because of its magical properties but because of its convenience.
If Disneyland sold bottled water from a cart right next to a drinking fountain where you got to watch the clerk fill the bottle from a hose attached to said fountain I would still buy the water because I want cold water in smallish sips when I'm 25 minutes into the Big Thunder queue a lot more than I want to suck down as much as I can hold whenever I happen to be near a drinking fountain.
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