What do you always take with you? My homeopathic kit; it's got 36 homeopathic remedies that have rescued me from food poisoning and infection many a time. I don't get inoculations or take anti-malaria tablets when I go abroad, I take the homeopathic alternative, called "nosodes", and I'm the only one who never goes down with anything.
http://www.telegraph.co.uk/travel/hubs/heavenandhell/6931557/Julia-Sawalhas-holiday-heaven-and-hell.html
(Note: Patient's opinion does not represent clinical evidence of effectiveness.)