Ok...I'll bite. What's the tap water ph, and where does it come from? The city or your own well...? If the tap ph is witin 6.3 to 6.8, I'd use it. If it smells like chlorine, let it sit overnight.

You've given two ph numbers. 6.4 is borderline low, which is why nobody has mentioned it...but 6.2 is too low. As the peat-based soil ages, it will begin to degrade, and lower the ph even more.