$15 in parts from your local hardware store gets you the basic tools you need to build a water-powered hygiene system. All you need is the "spray head" with flexible hose [0], plus the adaptor to make a kitchen part fit the bathroom piping (for some reason, kitchen and bathroom have non-interchangeable parts). You hang it on a hook next to the toilet, and you use it to clean yourself. I cannot live without these, and…
You aren't feeling like doing this yourself, several companies make systems like this for cleaning cloth diapers before dropping them in the pail. http://www.handyspray.com/Cloth-Diaper-Sprayer.html
>Approved backflow preventers or vacuum breakers shall be installed with any plumbing fixture or equipment, the potable water supply outlet of which may be submerged and which cannot be protected by a minimum air gap.