hope i catch you before you go down there...I am actually from down there but have lived up in Canada for 10 years now and also have to watch out for stomach issues when I go...the best thing to do ...proven and tested...my girlfriend is from up here and she has never been sick because of it... have a lot of yugurt before you go down there...the bacteria in it will killl any other bacteria...there is some pills as well..they are yugurt bacteria they work in combination with the regular yugurt...have lots of it at least for a couple of week before you go and you will be fine..have a great vacation!!