You have a couple choices. 1st one would be, go to the water n' Ice store and get filtered/RO water at $0.25/gallon. If this isn't an option, go to the grocery store and buy distilled water at $0.69 per gallon or more. The hydro store I go to sells RO water at $0.30 per gallon. you can mix filtered/distilled/ro water with tap water and a little ph down if you really need to. Or load the fuck out of your tap water with ph down (p.s. not even on the last resort list for some people)

If you've read as much as you want people to believe, you should know there is no magic formula or perfect answer for everything...

you need a ppm meter too

Expect to get pointed in the direction of other websites and grow articles if you are asking VERY basic questions, not that they don't need to be answered, but imagine how many people have the same questions when they first start out, I hope you know what I'm getting at. Ther is an incredible grow guide attached to this very message board, it will answer every question you have for the first 2 weeks of your grow. If you're any good at comrehensive reading, you could probably grow to your 1st harvest without asking any questions at all.

You also need to go to the store and pick up a big bag of top top quality patience, you're going to need it, plants grow about 1000 slower than paint dries.