Normal
Unfortunately there aren't any studies that have been on tap water and its effects on tarantulas so all we have available is anecdotal evidence. I have been using tap water for years without any ill effects as have many other keepers. It is worth keeping in mind that some places use chloramine instead of chlorine in the water and this does not dissipate like chlorine does. If bottled water will help you sleep at night I see no reason not to use it.