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I've been going with MC Hammers Vitamin H202 because you get one extra Oxygen in there. It burns going down, but damn it's good.
Nestle/Ozarka is usually my cheap option. Otherwise, I go with Smartwater or Fiji. Waiakea is interesting too.
Nestle has some challenges with basic humanity, what with their CEO declaring water is not a basic human right and should be privatized. Tap water is the correct answer, especially here in OR where it is always cold and sweet.