Take a Navy shower
I'm suprised no one's suggested a Navy shower valve.
It's a simple valve you screw in behind the shower head; anyone can do it. You just get in the shower, wet yourself, then turn the valve off while you wash. It keeps the hot/cold mix constant, so you don't have to readjust to find the right temperature, or risk scalding yourself.
I LOVE showers, and I love being squeaky clean. My old showers lasted 10-15 minutes or so (I shave in the shower, as well).
I get in the shower and wet myslef
Then turn the valve off
I wash my hair and wash my beard with the shampoo (it softens it for an easier shave).
I turn the valve back on and wet my washcloth.
Then turn the valve off.
I wash the top half of my body, then turn the valve back on and rinse the washrag.
Then turn the valve back off.
I wash the lower half of my body, then turn the valve back on and rinse the washrag, wring it out, and hang it up. I then wet the back-scrubbing brush.
Then turn the water off.
I wash my back, then lather my face. I turn the water on, rinse out the back brush, and wet my razor.
Then turn the valve back off.
I then shave, turning the valve back on two or three times for a second or two to rinse out the razor.
Then, I turn the valve back on and rinse off.
Using the valve probably adds 2 or 3 minutes to my shower, but, I've been using it for over two years, and have literally cut my water usage in half.
You can get them for less than 15 bucks at any Wal-Mart, Home depot, or Lowes.
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