Arrowhead Distilled Water

I have distilled water with a KH of 0 and the ph is about 6.4 or something like that. Why do you need to know the ph?
 
You could save money using RO water instead. Glacier Water has vending machines around So Cal that charge 30 cents per gallon for water that is virtually distilled quality. The stuff I buy measures around 6.6 PH. and very low GH/KH.
The pure distilled should measure right at 7.0 (I think)
 
AquariaCentral.com