Damn OSMOSIS!!!
Where I am there is a huge amount of chlorine (you can smell it in the water) I use water that has been boiled and left to stand for 24 hours for the snakes and myself. Chlorine is removed over the 24 hours (the water container cannot be sealed up tight) The water isn't very hard and there is a small amount of fluoride but I am not overly concerned about it. I use distilled water for misting as it doesn't leave water marks on glass, and mixing Chlorhexidine soln's. Chlorohexidine is made inert by contact with anionic compounds (copper and iron for example) that might be found in tap water especially hard water. No point in spraying blue water about!
upon some thought I think Flouride is an anionic compound... so chlorohexadine solutions mixed with tap water are somewhat less effective. I have no recollection on amounts my chemistry is a bit rusty.