Put the positively attached wire inside the saucepan (or whatever vessel you have chosen to use) and the negatively attached wire outside the vessel and pinch them together with the vessel in between. Just like it shows on the illustration.
I have recently been looking into all this water stuff and am courious as to how to distill water. It looks as I can boil it in a pan and dish it out, is that true? If not how do I build a still?