If you are travelling to areas with known disease outbreaks, get yourself vaccinated before going.
To manage/prevent heartburn, do not take large meals before going to bed, and avoid lying down immediately after eating. Also, keep your head raised when sleeping (use two pillows if necessary).
High-fibre foods (in moderation) are good to prevent constipation.
Avoid eating greasy foods that are high in fat and fibre when having diarrhoea.
Don’t forget to pack your medications.
Source : The Star Online