I did a google search on "Florida law adultery criminal" and found a web site that claims that under section 798.01 of the Florida code that:
"Whoever lives in an open state of adultery shall be guilty of a misdemeanor of the second degree, punishable as provided in s. 775.082 or s. 775.083." Reportedly, punishment for a misdemeanor of the second degree can be up to 60 days imprisonment.
If Jeb Bush really wants to help Terri, why doesn't he direct Florida law enforcement to arrest Michael Shiavo under this standard and while he is in jail (even overnight before the bail hearing) have, or petition to have, a new guardian appointed, perhaps on the basis that Michael can't do the job in jail or must be replaced because of the criminal charges?
I don't know how new guardians are chosen but would think her parents are the logical alternative and they would direct her to be fed and given water again.
They can argue about whether or not it was a justifiable action later.