What type of water should i use??

[Purple Daddy]

Your water becomes stagnant and loses oxygen after it sits and your roots need oxygen from the water.

[Rusty Trichome]

If concerned with your water quality, check online for your local water company's Water Quality Report. Should tell you exactly what ph it is, what's used to chlorinate it, what other crap is in it...

I was living in Vegas for a few years when I was first starting-out. The tapwater there is almost undrinkable and is definately stinky. I'd let it sit out overnight (offgassing the chlorine) and water the plants with it the next day. Never had an issue till we got our R/O unit repaired. The plants prefered the tap water, so I ended-up having to get the water from an outside spiggot. (not hooked-up to the R/O)

Water is 1/3 oxygen to begin with. But letting the water sit-out does lower the available dissolved oxygen. (an oxygen molecule not attached to another element or mineral) However, when you add the water to the soil, air (and oxygen) is pulled-down into the medium through a process called suction. Worrying about oxygenating the water prior to adding to the soil, is, IMHO...a waste of time and effort.

Interesting and informative article about water...:
Common Water Measurements, from USGS Water Science for Schools

Al things 100% similar, the shade or hue of a cannabis leaf can vary from strain to strain, and is controlled by recessive genes, I guess.