Soil, for the most part, will take care of itself in the PH dept. You can always get an idea of what the PH of the runoff will be, but, if its not an issue, don't make it one!!!
I simply make sure that my ph falls within' the 5.5-6.1 range for hydro, if its low, say 5.2, I'll just add a bunch of water till 6.1 and let it go. (I run a under current system)
Within' a couple cycles, it's back to 5.8-5.9 where it should be. I initially was super paranoid about letting it wander away from 5.8 because of nutrient uptake but now, I just let it kinda wander within the acceptable range and things are fine. Fighting PH is the only reason I'm jealous of soil growing!
As far as a high ph water, I'm just glad it's not hard water. I can deal with high ph, but that slimy, never feel rinsed feeling of hard water is terrible!