First time in CDMX? The altitude might hit you with a headache, especially after a flight, a few drinks or a full day walking around. Hydrate more than you think you need to. And one important rule: don’t drink tap water. Stick to bottled or properly filtered water. My move: stop at any OXXO or 7-Eleven and grab an Electrolit. I usually have one on long, hot or late-night days. There are sugar-free options and a million flavors, but my picks are lime-lemon, apple, passion fruit or green tea. Keep one cold in your hotel fridge. Future-you will be very happy.