Okay, some things to know!
Firstly: Watch for these symptoms!
I would also look for confusion in your friends. You can't always recognize what's happening to you in the moment, so it's important to keep an eye on those around you just in case.
1. Drink. As long as it's non-alcoholic, you're doing great, but I highly recommend something like Gatorade or Liquid IV if not straight water. Either of those types of things are designed to get you the electrolytes you will for sure be sweating out and help you absorb and use the water you're drinking. (Please be mindful of sodium intake if you have a heart condition)
3. Try to have a kit in your bag. Chemical ice packs, a bandana that you can wet and tie around your neck, an umbrella to avoid the sun, a pocket fan, etc. It's important to have things to help cool you down when you're out and about.
4. Please remember that you can overheat fast. I remember last summer, there was like a month in my area where five minutes outside could give a healthy grown man heat stroke bad enough to go to the hospital. So try and stay inside as much as you can and limit your travel if at all possible.
5. I know you may not want to, but EMTs are your best friends. I'm serious. If it comes down to it, sometimes that really expensive ambulance is the difference between life and death. They won't judge you for this, either.
6. If you have a medical condition, humidity will almost certainly make your life a living hell. You know what to do by now, but just to be sure, make sure you've planned ahead if you can. Make sure you have a ride to any appointments and make sure that water bottle is full before you go anywhere.
7. Please make sure you have a list of medications, health conditions, emergency contacts, etc in an easily accessible place in case you faint. EMTs and whoever else helps you is going to need to know who to call and how to help you if you're unconscious.
8. Humidity affects your breathing, so go slow. It's probably going to feel like you're breathing through soup, so take your time and don't push yourself. Keep any inhalers or things like that on hand and remember to breathe slowly and deeply.
I'm pretty sure I'm forgetting some things, but this is a good primer. Heat is no joke and humidity is even worse, so I'm serious when I say be careful. (Said as someone who's had both heat exhaustion and heat stroke)
