You can a lot of great stuff here:
http://customhydronutrients.com/zencart/index.php?main_page=page_2
Actually, everything you need to mix your own nutes is right there.
for an organic pH down you can use citric acid.
You can also go to , which if you want "organic" will be a great source for you.
You can also mix your own teas, but you wont be able to hit fatmans numbers with that. You need to use something with a guaranteed analysis. I can help you with ratios if you are having trouble with calculations. Just PM me or if you want to keep it in this thread thats cool too. In fact, that would probably benefit other farmers as well with the same questions.