My family is in Florida enjoying the final weeks of summer and I don't think I have to tell you how hot it is here. It has been sunny and humid pretty much every day so far, with little rain breaks in the evening. When you're on vacation in a hot climate like Florida, it can be difficult (especially when you're not used to it) to stay hydrated and have energy.
Because you are constantly sweating, you need to make sure that you are replacing lost fluids with plenty of water. I've stressed this many times before, stating that being hydrated is one of the most important parts of maintaining homeostasis and health throughout your body.
However, when you sweat, you are also releasing important electrolytes that need replaced. I usually recommend coconut water, but if you are going to a Disney park (like we are) it is easier to just bring a water bottle with you. I have found that Trace Minerals Electrolyte Stamina Power Pak is one of the best electrolyte powders that you can add to your water.