I've Been on 50 Flights in the Past 2 Years — This Is How I Don't Get Sick

Sorry to be the literal buzzkill here, but alcohol can actually compromise your immune system, and sugary soda creates an ideal breeding ground for germs. You'll want to skip both, even if they're free and delicious.

Instead, mix up your own cup of immune-defending, cozy tea. Airlines always have hot water for tea, but typically the options are your classic black breakfast teas. Since you can't brew up freshly-sliced ginger and mint from your economy coach seat, travel with your own packets and even honey sticks (honey is antibacterial!). We like Davids Tea Organic Cold 911 Sachets ($10).