Dehydration is one of the main causes of illness at festivals. They usually take place in the summer and the warm, sunny weather - and dancing - can mean you lose more fluid through sweating. Also, alcohol is a diuretic, meaning it can make you pee more. It’s also easy to forget to drink water when you’re having fun, especially if you don’t have a refillable bottle with you.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/how-to-drink-more-water-and-stay-hydrated-at-a-festival