I did something similar way back when, only I used
carbon rods scavenged
from dead "D" cells for the electrodes. Tried it first with batteries,
and that was awfully slow. So then I got this bright idea of using a
selenium rectifier and a line cord I had handy...
ROTFL!
I had to keep adding water, of course, and since
"stuff" in the water
stayed put as the electrolysis proceeded, the water got darker and
darker. This was right out of the tap, and it put me off of drinking
water for quite some time. :-)
ROTFL! 2.0 enhanced turbo plus version! :D