With this extremely high humidity it is essential for you to keep hydrated. Drink plenty of clear liquids that you can see through. If you can't clearly see through it then it's not hydrating you. Water and sport drinks(if you are not diabetic) are best. Stay away from drinks and juices with high sugar content.
Coffee and pop will actually dehydrate you. They are so concentrated that your body loses fluids just trying to digest them. For every cup of coffee or pop you drink, you need to drink 3 cups of water just to break even.