Why would they be concerned about the PR about this topic at WDW? Orange County does this and there hasn't been a huge backlash for DLR.Both. The treatment plant generates potable water but nobody actually drinks it. It's a PR issue. Even if it's perfectly clean and sanitary and meets all the standards out there, they're not going to allow the Orlando Sentinel to publish the headline "Disney serves guests water generated from human excrement."
http://www.cnn.com/2014/05/01/world/from-toilet-to-tap-water/