I would take Reedus Joah. With his PICT MAGIC he can make any material that we need. A house for shelter, a bucket to get water, hell he can draw and we just get out of the island! He is sweet and shy I really like his personalty. Plus, he can teach me how to draw. With him I won't die.
Another person I would take is Warrod Sequen. If we are in an island surrounded by nature he is the guy to call. His green magic can also help to grow plants. I think we can even get out just grow plants from the sea or something and get out.