An interesting thing i have found on ebay
Metal Hollow Shower Enema Vaginal Anal Cleaner Wash Colon Douche Nozzle
Strange little thing from China mainland. I got the large one to terminate the business end of a 9/16 inch thick colon tube.
The spray/squirt unscrews from the shaft. Watch out for that.
You might like a 6 inch diameter 18 inch long firm foam exercise roller.
It Makes a nice hip booster to give ready access to a butt.
Delta faucets makes the best shower spigot diverter valve
Delta Faucet 3-Way Shower Arm Diverter
A gallon of water weighs over 8 pounds. Get an S hook for your gallon bag as thick as will fit its hanging flap to help your reservoir last longer with regular use.
Leather punch is handy for making spray holes in the sides of a do it yourself colon fill tube.
Stainless hand rails in your shower stall mounted at 45 degrees to help get off the floor with a loaded belly.
Sprite shower filter is nice too, especially when maintaining your reservoir water level.
Glass top digital bath scales are handy for weighing your fill. It lets you know how much is really weighing inside or how much you have managed to keep.
If you are careful, you can bring it into the shower, just don't drown it.