His family in El Salvador thought he was dead . The Mexican Ministry of Foreign Affairs is identified as Tom Armbruster , four weeks . Man says he lived off turtles and rainwater while adrift . Companion died four weeks after pair left Alvarenga , Mexico says .
His family in El Salvador thought he was dead . Castaway is identified as Jose Salvador Alvarenga , 37 . Man says he lived off turtles and rainwater while adrift . Companion died four weeks after pair left Mexico , Alvarenga says .