A few things to consider here.
You don't say the duration of your travels, or how you intend to travel, and the climate of the country you are visiting. In brief, you should ensure you have adequate insulin/meds (i am unsure what type of diabetes you have) fast acting sugar for hypo's, such as gluco-tabs, blood glucose meter and strips, and plenty of food to see you through until you reach your destination. It is always advisable to get a note from your doctor when traveling abroad, this is to say that you have diabetes and to explain that the medications you are carrying are essential to treat your diabetes. Also carry with you a repeat prescription listing all the medication you take, not just diabetes, but all meds. Always carry some medications in your hand luggage, don't store it all in your suitcase in case it gets lost, and don't store insulin in your suitcase should you be flying, as the freezing temperatures in the holdall of the plane can damage insulin.
Make those you are traveling with aware that you have diabetes, likewise it may be necessary to inform hotel/accommodation of your condition, and ask them to store insulin in a fridge for you should you be type 1. Certain climates can have a effect on diabetes control, the warmer the temperature, the more easily it is to run the risk of going low due to sweating/physical activity etc. Also, the warm climate effects insulin, so this should be kept in a cool place to stop insulin from deteriorating. Cooler temperature can also stop insulin from working should it start to freeze, so take measures to avoid this, some glucose meters don't work in cold temperatures, just as they don't in hot temps, so bear this in mind.
Hope the above has been helpful, and best wishes on your journeys!
Nigel