Water for Curing Rock

[prospero31]

I have gone ahead and am creating a reservoir of RO/DI water in a large plastic container in which I will drop the live rock for curing when I get it.

Currently (no pun intended) when I stick my hand in the water, I get zapped with a small jolt of electricity. How is that possible? The DI portion of my plumbing (hey all the plumbing was actually fun) drops through the ceiling from my kitchen after a T connection (other end goes to drinking water). I read about grounding etc.. but I was more concerned with that in regards to my tank rather than the precursor curing stage - should I be grounding the curing "vat"?