The story of how Bruce Beekman ended up in prison can be traced through years of psychiatric appointments, emergency room bills, probation paperwork, and other documents — all of which his mother, Debra Montgomery, keeps carefully organized and color-coded in a three-ring binder. It leads to a cell in the Arizona State Prison Complex in Phoenix where Beekman — in the throes of a psychotic episode, splashed or, depending on which account you believe, spat — lukewarm sink water on a correctional officer on August 3…