Haha, good for you. I hope you enjoy it.
I should note, though that many people do use distilled or RO water to calibrate their refractometers and hydrometers with no problems, but I have seen inaccuracies with these methods, so it is not a way I choose to do it. I use calibration fluids (which are cheap btw). For all that matters, you could just put the calibration fluid in the hydrometer, though it would take probably half the bottle ($3/bottle).