Is it safe to drink the tap water?

No. Never drink the tap water. Pack a reusable bottle with a built-in filter or buy bottled water at any OXXO convenience store.

Do I need fancy clothes?

Generally, no. Mexico City is stylish but casual. Smart-casual attire is sufficient for even the best restaurants in Polanco or Roma.

Packing for Mexico City: A Practical Guide

Pack for high-altitude spring weather year-round by dressing in layers that can handle cool mornings and warm afternoons. Prioritize comfortable walking shoes and a versatile jacket, as the weather shifts quickly throughout the day.

Master the layering system. Mexico City sits at 7,300 feet. Mornings are often 45°F (7°C), while afternoons hit 75°F (24°C). Bring a lightweight base layer, a long-sleeve mid-layer, and a packable windbreaker or denim jacket.
Select the right footwear. You will walk on uneven stone sidewalks and cobblestones. Leave the heels at home. Bring one pair of broken-in sneakers with good arch support and one pair of comfortable leather boots or flats for nicer dinners.
Pack for the sun and altitude. The sun is intense at this altitude. Pack polarized sunglasses, a hat, and high-SPF sunscreen. You will burn faster here than at sea level.
Prepare for the rainy season. If visiting between June and September, pack a compact, high-quality travel umbrella or a lightweight waterproof shell. Downpours are usually short and heavy, occurring in the late afternoon.

Is it safe to drink the tap water?: No. Never drink the tap water. Pack a reusable bottle with a built-in filter or buy bottled water at any OXXO convenience store.
Do I need fancy clothes?: Generally, no. Mexico City is stylish but casual. Smart-casual attire is sufficient for even the best restaurants in Polanco or Roma.