A link to the actual site is more useful: http://themiraclemachine.net/

I'm wondering how hard it would be to reverse engineer this, reading the "we're keeping the exact science under wraps".

It's an "Arduino microcontroller" -I wonder who came up with this expression, since the Arduino is the board-.

How can someone customize it to make a different kind of liquor.. Or connect two of which functions are inverse: Water into wine, and then into water again..

"Keeping the exact science under wraps" means "there is no science of note, we are charging a lot for household products".

Liquor is distilled, so the only way you could customize it to produce liquor would be to add a considerable amount of hardware to it. In the US, doing so would be illegal without a license.

And there goes my dream evaporated ... To be condensed, if you know what I mean :)