SANTA MONICA, Calif., April 17, 2000 -- Five years ago, “Waterworld” threatened to destroy Kevin Costner’s career, what with all the negative press surrounding its budget overruns, logistical filming problems and on-set rifts. And the film reportedly did destroy Costner’s working relationship with Kevin Reynolds, the director who had previously worked with the star on "Fandango" and "Robin Hood: Prince of Thieves." (Remember that, after Reynolds finished shooting "Waterworld," Costner fired him and edited the picture himself -- and threw in some CGI effects to enhance his own receding hairline.) But now that’s all water under the bridge (pardon the pun). According to Variety, Costner and Reynolds are seriously thinking about working together again and -- get this -- the movie they want to make takes place mostly at sea. Reynolds and Costner would reteam for "Okracoke," a