Dannye, it
is possible to waste/destroy water, though not in the way you're thinking (and not in the way
Greenpeace would like you to think). Tainted water is relatively-easy to reclaim, but water which has been
split through
electricity can only be recovered if you manage to capture the
hydrogen before it escapes into
deep space. So don't dump any fully-charged
car batteries into the
ocean, since not only would that be
Bad (putting lots of fun
lead and
sulfuric acid in our ecosphere) but it'd dissociate a lot of
water into
oxygen and
hydrogen.
This is also why putting a live wire with a strong AC into water results in an explosion - on one cycle, the water is heated and dissociated with one polarity, on the next the water is heated and dissociated with the other, meaning that you have, 60 times a second, very hot oxygen and hydrogen being put in the same place, where it quite happily burns, releasing all the energy which went into dissociating the water as it returns to a state of higher entropy. End result: The electricity is very efficiently converted into pure energy, and you get to find out how much energy there really is on a power line.