“Dead Water” (*1/2 out of four) was a slipshod thriller which rips off the similar (and similarly titled) “Dead Calm” in which a couple (Griff Furst and Brianne Davis) go out to sea with their best friend (Casper Van Dien) and they all find themselves under siege from a vicious pirate (Judd Nelson) but all may not be what it appears. Good actors are literally left high and dry by weak filmmaking and an even weaker script. For better recent movies about terror at sea, watch “Captain Phillips” or “All Is Lost” instead.