I am using 5 gallon soda kegs also known as corny kegs. I have two for beer, one for home made soda (usually orange cream soda) and another for ice to keep them all cool in an insulated box.
when I go offshore I will be sure of local laws where i am going, as to not piss anyone off. in most cases where beer is regulated at entry, it is for import reasons. so if you are not selling it usually having a single keg (equal to 2 cases) is not a problem. if you make more while there, you may want to make sure your supply is low before kegging the next batch.