Best nutrient schedule

hello, I am starting several blueberry plants from seed. they have germinated and have been growing for roughly a week. I plan on growing 4 plants, (they're feminized) i have a 150w HPS bulb and 2 75w fluorescent 'cool blue' bulbs. the nutrients i am using are green light "super bloom" (for the phosphates) and miracle gro organic choice all purpose plant food (for the nitrogen). the tap water i have has a ph of roughly 8, which is much too high. my question is: should i buy distilled water and use the nutrients as directed (once a week) with watering as needed with distilled water, or use tap water and add sparse amounts of acidic nutrients (nitrogen while veg, phosphates while blooming) and use this mix continuously? also i have heard it works to use phosphates or a "super bloom" throughout the entire process; is this ture?

i apply using a spray bottle while my girls are still young as to not disturb them with steady wind flow with extraction fan venting directly outside
i use an organic soil mixture with roughly 75% organic potting soil, 5% sand, 10% perilite (however you spell it), 10% pre mixed potting mix.
all nutrients, water, and soil, (with exception of perilite and "super bloom) are 100% organic, and i would like to keep it as natural as possible (i know its an oxymoron seeing as i am imitating nature indoors)

any help would be appreciated. thanks

Sounds like the best thing you could do is buy some Ph testing equipment....

First I would go to your water company's website and see if they posted their annual water report. This will tell you the pH, hardness, and what trace minerals and contaminants are in your water. If you have questions about anything in it, just ask and we'll do our best to help you out. I personally use city water and in my organic garden, I don't pH it, but in my containers using synthetics I need to keep pH between 5.8 and 6.3, otherwise I get micronutrient lockout.

Also, most cannabis growers here don't use MG, so you won't get as much help compared to if you happen to run Fox Farms or Advanced Nutrients. It doesn't mean that MG is crap, it just means you'll be talking to an audience that doesn't know much about them. Your best bet for information on MG products is going to be MG's website and general gardening forums like GardenWeb.

I'm assuming this is what you have? I did a quick google search and found this label (PDF).
http://www.scotts.com/smg/products/Miracle-Gro/pdf/Organic Choice 32oz bottle final.pdf

If this is right, then an NPK ratio of 8-0-0 is what your working with. That's fine, but you'll also want a tiny bit of P & K too. I learned this from growing tomatoes and fruits. When you only feed N, you get nice tall lanky plants, but you also get few bud sites and smaller fruits. Try to aim for an 8-2-4 or an 8-4-4 ratio to keep things balanced.

And of course, best of luck to you man. Hope you have a great harvest.

i tested distilled water and it comes up very acidic,this is bad for plant is it.