No, I would never use an additive on tap water. I've never noticed hotel tap water tasting any different than any other tap water. And that's all I drink, unless I can find a pure natural source, a good spring, or pumped well. In that case I'll dump my tap water and fill my bottles with natural water. I did that the other day above tree line up on Mt Evans, with fresh snowmelt a few steps off the road. In North Cascades NP I could reach small cascades at arm's length while still on the bike.