Hydration for Travel
What to drink at altitude, on long flights, and in dry hotel air. A few field notes for staying balanced far from your own kitchen.
Travel dehydrates you quietly. There is no single moment where you feel it happen. It builds up from dry cabin air, skipped water fountains, one more coffee, and a schedule that never quite pauses for a glass of water. By the time you notice, you have a headache and a night of poor sleep behind you.
The fix is not heroic. It is a handful of small habits, applied at the moments travel is hardest on you. Here is what we have learned.
On the plane
Cabin air is kept at roughly the humidity of a desert. It often sits below 20 percent. On a long flight you lose water simply by breathing.
The old advice holds: a full glass of water every hour in the air. What is less discussed is that electrolytes matter here too. Plain water on an empty, dehydrated system passes through quickly. A low-sugar electrolyte drink helps the water stay with you. Buy a bottle of water past security and stir in a packet of Propel Berry from your box.
Skip the alcohol on flights longer than a few hours, or pair each drink with a full glass of water.
At altitude
Above about 8,000 feet, your body loses water faster in two ways at once: you breathe harder in thinner air, and drier air pulls more moisture from every breath. Altitude headaches are, more often than not, dehydration headaches.
Arrive already hydrated. Start the day before, not at the trailhead. Then drink on a schedule rather than on thirst, because altitude blunts your thirst signal. A bottle with electrolytes in the morning and plain water through the day works for most people at ski or hiking altitude. Gatorade Zero Glacier Freeze is the one we reach for at the top of the lift, because it is easy to drink cold.
In the hotel room
Hotel air conditioning and heating both dry the room aggressively. If you wake at 3 a.m. with a dry throat in a hotel, that is the building, not you.
The evening routine that works: a full glass of water when you get back to the room, before anything else. Keep a bottle on the nightstand. If the room has a kettle, a cup of herbal tea gives you warmth and water at once. Hotel tap water often tastes of chlorine, which is reason enough to carry something to put in it. A stick of True Lemon is unsweetened and turns a flat glass into something you will actually finish.
The travel kit
None of this requires equipment, but a small kit makes the habits automatic: a bottle you refill past security and a few low-sugar electrolyte packets for flight days and first days at altitude. Single-serve packets are what make this portable, which is most of why we put the Propel + Gatorade Box together the way we did. Drink before you feel like it.
Hydration is the cheapest upgrade in travel. Sleep and energy both improve when you keep up with the water.