Staying hydrated is important to avoid headaches, which I easily get while traveling. I used to always drink the offered free sodas or coffee only, but realized that is not enough. Now, I always bring my own water bottle with me. I fill it up with water at a water fountain after the safety check or buy some, if there is no free source of safe drinking water available.
While on the plane, I keep it topped off to make sure, I can stay hydrated when I want. This simple method has added much to my well-being while on a plane. The water as well as a remedy against head-ache (just in case), chewing-gum, and some cereal bars are my most basic travel essentials to keep me in a good mood while traveling.
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