Ok so gH test was done
I used my API gH test kit and got orange color test water at drop 2 and green was around drop 4-5 if I do count my first drop witch only gives me a light yellow color I get a total of 4-5 drops so my dgH is 4 or 5 and my ppm is between 50-100ppm (3-6dgH) range on the chart from tap and aquarium
I would go with this water and not start fussing with adjusting it. The pH lowering to 7 in your tank suggests there is little buffering, and your GH and KH numbers back this up. So in the tank as the biological system is settling, the pH is likely to lower below 7 and this is ideal. You really have no worries.
I agree with seangee on the acclimation, but would just add that temperature should be equaled so float the bag of fish in the tank to equalize the temperature (this usually takes 15-20 minutes or less, depending). The net the fish out. Do not pour the bag water into the tank. A temperature change that is sudden can seriously stress fish, but allowing it to equalize by floating solves this. I use my fingertips to test the temp.