late 70s or real early 80 people are on a island . thay are trapped there. if thay go in the water it bubbles and kills them that’s all I remember its the water that kills them not a creature I saw it on a black and white tv so I don’t know if its in color are not I don’t know if its a tv show are a movie
Maybe: The Lost Continent (1968) – http://www.imdb.com/title/tt0063240/
might be “The Raft” segment of “Creepshow 2”
http://en.wikipedia.org/wiki/Creepshow_2#The_Raft
the FLESH EATERS (1964)
http://www.imdb.com/title/tt0058101/?ref_=nm_flmg_act_31