How to Save on Air Travel Expenses
It’s pretty much impossible to bring water past security, but paying $3 for a bottle of water at the gate is just plain silly. Instead, grab an environmentally-friendly lightweight aluminum water bottle, many of which cost under $10. Once you're past security, fill your own bottle at the water fountain. You'd make back the cost of the water bottle, and earn a profit, by the end of two round-trip flights.
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So maybe you can’t change your health overnight. But you can get a head start.