How would i build a robotic urinary bladder?

Question

LOL funny que but what could i use to repicate the human urinary bladder

yes i want to build a robotic bladder to make a fake person "p**s" LOL

Answer 1

This has actually been a field of research to help people who have had neurological problems that prevent normal emptying of the bladder.  One of the pioneers in this field is Emil Tanagho, chairman of the department of urology, University of California, San Francisco.

Answer 2

dont they have those in baby dolls?