It's very low in minerals, so be careful you don't leach out the soil.

I run mine to the flower beds.

distilled water...ideal for plants but not in great volume. I use mine for a single banana plant.

The pH of water for blueberries will have no effect on them because the soil's buffering capacity is WAY more than water. But adding 1 cup of apple cider vinegar to 5 gal. of tap water drops the pH to around 4.5 if it makes you feel better.

My AC runs into a tiny bed next to the house where I have ferns, selloum philodendron , an asparagus fern, and a volunteer fan palm that is going to get much too big and will have to come out at some point. They all love the constant water supply during the humid months in summer and suffer a bit during the rest of the year as I tend to forget to water them too often.