🚨 The ONE drink guaranteed to wreck your vacation

Here's how to avoid becoming a horror story like these travelers

The water in Slovenia's Lake Bled looked so crystal-clear that you could drink it. Which is exactly what one of Alyson Chadwick's travel companions did. It was the drink that ruined her trip.

“She was sick as a dog for days,” Chadwick recalls.

Chadwick, who works for a nonprofit organization in Washington, D.C., says she'll never forget the lesson: "Never…