I agree with everything except the no tap water. I use tap water and I don't even let it sit out over night. HaHa, chlorine and flouride, that's just a myth that it harms your plants. In fact, if you use it right away it's still cold will help your plants.

I should mention that I'm talking about soil not hydro, but unless your tap water is unfit to drink, it's plenty good enough for your plants. Plus, it's way cheaper than any alternative so you shouldn't be saying never to use it.