What water should I use??

So, after Hesitating for so long I’ve decided to start my own grow. I bought a few books and watched a lot of YouTube and now i finally got it All set up. I want to germinate straight in to soil but I don’t know what water to use.. can I use tap water? should I use Ph⬆️⬇️? Why or why not??

I Appreciate any help/ advise 🤙🏽 here’s what I got going on so far. I’m only missing the humidifier. right now it’s been 75-79 degrees and 45-51% humidity so once I get my humidifier tomorrow to do my fine tuning. i should be completely set.