I use tap water all the time. While I do suggest filling your watering bottles up a day or two before watering so the chlorine will evaporate out, I dont. I have never had a problem, but I suppose thats all in your water company and how much they put in it. I usually just fill the jugs with lukewarm water and just dump it in, never had a problem yet. Feel it out and experiment, some areas are probably different than others.