Coincidentally, pure or de-ionized water is actually a very poor conductor of electricity. The higher the TDS (Total Disolved Solution) of the water, the higher the conductivity. In other words, sea water for example with it's solution of salt and other minerals is highly conductive.
Tap water, be it from rain, wells, rivers or reserviors has quite a high TDS. Drinking water is not so high.
So to be really safe, have a shower in de-ionized water. It will probably make your shampoo go a lot further and you'll be squeaky clean!
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