First of all, if you've started out with soil that is properly pH adjusted, pH will be a non issue in any organic grow. Do not stress over the pH of what you are putting into it, because the pH of your solution will be "buffered" to that of the soil. Run off is an inaccurate way to check pH as well, since it has just "run through" the soil, and wasn't in contact long enough to be buffered.
To answer your question, no I would not used distilled or RO water with organics. The mineral content of your well water will contain essential trace elements and micro-nutrients needed by the plants. BTW, what dry organic ferts you using? Check out this line:
www.espoma.com They are very inexpensive, and will give you STELLAR results. They carry the most complete line of organics imaginable. I keep a bag of the BioTone Starter plus, Kelp meal, green sand, and compost starter on hand.