I travel quite a bit . My pump and app and my pdm take care of the time changes although I have to switch to manual for the time changes to work. Always take spares pens needles vials sensors Its like a go bag. I once had to buy insulin in another country not a good experience so make sure...
I think i can say after 50 years type 1 that if I miss carbs i have no energy and can feel quite unwell No carbs means your body will convert fat into energy but this causes the release of ketone which can make you feel even worse. You're correct about testing though absolute must I'm lucky...
You need to eat long acting carbs ie bread pasta rice just a little will help
Fruit has a fair amount of sugar so don't eat too much just your five a day Good luck