Boiled tap water will be no better then regular tap water. You should take Ronjohns advice and just let the tap water sit for 24 ours for the chlorine to evaporate off. But if you want the best water possible, then go get a reverse osmosis filter. But they are very expensive and for every gallone of water you get, 2-3 gallon will be going down the drain. But if you use R/O water, you will have to add Calmag to replace the trace nutrients that were remove by the filter.