Contact Carnival's special needs department email@example.com
they can probably work with you. Many ports have import restrictions that all cruise lines seek to honor. I have never seen anybody stopped trying to take food off the ship.
Many years ago a friend of my organized a Celiac cruise on the Big Red Boat. I hope you are able to have an excellent time.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Alaska 2014 - haven't picked a cruise yet
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, Caribbean 2013