10. A fire because of a water bottle
This may sound strange, but if direct sunshine gets on the bottle, it can really cause a fire. The thing is, in this case,
the bottle will work as a lens and concentrate the heat in one spot. So, it is best to keep these bottles away from windows and to never leave them in a car.
11. Antihistamines should always be with you.
It may happen that you are allergic to something that you have never encountered before. And it could be such a severe allergic reaction that it might just be lethal unless you get qualified help.
This is especially important on trips when people try new foods, see new plants, and go to completely new places.