Be wary of the multitude of supposedly healthy snack foods available. Although with some, the ingredients may seem okay, these are still processed and somewhat devitalised foods which don t have the optimal chi needed for digestion and assimilation. In Ayurveda, processed foods are seen as devoid of ojas and prana - the life force and thereby use up more energy in their digestion than any nourishment that they offer. As an occasional treat they are fine for people in good health with good digestive capabilities. Read labels, trust your intuition, make your decision.
Some people like to drink very little when travelling.
Others tend to dehydrate when travelling, especially by air. Apparently there are substances in it that help metabolise the oil and reduce the possible effects. Take along some bancha tea bags, green tea bags, roasted grain tea bags and any herbal tea that you use. These always travel well. Or buy dried daikon, lotus root etc.