Bidets although common in Europe as standard bathroom equipment are a matter of great hilarity in the USA.
My husband recently asked about the cost and availability as he is incontinent of urine after a prostatectomy and an intestinal disorder that causes frequent diarrhea.
When my research began I was thinking of a freestanding unit that would take up as much room as a standard toilet and require hot and cold plumbing.
To my surprise technology has advanced and it is possible to buy a unit that fits any toilet with minimal plumbing. In fact the manufacturers say this is an easy do it yourself job as long as you have a GFI protected electrical outset nearby.
There are really cheap ones for about $300 but use only cold water. For something really satisfactory expect to pay around $1,500 For this price you will get the unit which replaces the toilet seat, an integral heater front and back sprays and a warm air dryer. There is either a remote or attached control panel and a safety feature that prevents operation unless someone is sitting on the seat. For myself I would choose the remote because it is difficult to turn around to reach the controls. It sounds like an expensive luxury and of course it is but imagine the convenience of a male relative being able to take a female to the bathroom and avoid the embarrassment of the clean up process. How about a night out ladies while hubby watches grandma? The toilet continues to be used normally by everyone else if they don't want a nice warm wash. if you do a web search you will come up with products from major manufacturers and of course the home improvement stores will be able to order for you as will your plumber.