Watch out... do not feed the Ego of the Stinkster. It is dangerous! RRRROWR!!!

I'll try not to steer ya wrong; I'm a wicked cheapskate myself and have been known to dumpster-dive for equipment. But there's a couple things you just can't get away with skimping on. Calmag is one if you run RO or distilled.

But remember that if you are in soil, tap water is almost ALWAYS perfectly fine.