Hi Helen
A friend who travelled around india, change his insulin pens for disposal ones before he went, so has each pen was finished he could be chucked...
I would contact you diabetic clinic, as I know mine will help and advice, not only amounts of insulin, avaiblity in countries that you want to travel to, but also help with guidence of how to readjust your regime to match a new time zone, all the require is enough information from you and of cause enough time for them to workout the details...
A piece of kit I have found brillient to help to keep my insulin cool, is a filo wallet, you dunk this in water and it keeps the insulin at the right tempreture, the lengh of time depends on how hot it is, but you can just reactivate by dunking in water again and again...
jo