There is an "enema-nurse" Nurse Wanda in South West Michigan that will collect your Urine via catheter and then re-introduce it into your body via enema. Since urine is antiseptic it would not be a problem using your own for an enema. Do NOT use someone else's unless you know their health history. Here is her bio from Enema Lovers Guide to the WWW:
" Hello.Im Ms.Wanda,im in the grand rapids michigan area. we have tons of restraint equipment and have,exotic enema bag collection,enema impliments ,electro, catheterization,watersports, sounds, huge insertions, heavy rubber and dozens of costumes,i can play the rubber enema bitch,traditional old fashioned nurse,or any of a hundred other roles."