I carry pills around with me at all times. They are always in my purse in little pill cases that I bought at my pharmacy. I put the little cases into a small cosmetic type bag that I put into my waistpack when I travel. Yes I use a waistpack, it really works for me since with my fibromyalgia shoulder bags can sometimes make me hurt even more. As for on a plane always make sure you have your meds with you at all times, NEVER put them in check luggage as it could get lost, or take too long getting to you, etc. I made a mistake on my last Disney trip. I used a prescription bottle that did not have a child-proof lid (my kids are grown so don't need them anymore) and when I arrived at the hotel I noticed that the bottle had opened and my meds were all over my bag. Luckily I was able to gather tham all, but it made me realize that from now on I will use a child safetly bottle for traveling. I usually don't carry all my pills at one time into the parks. Every night I check my cases and make sure I have enough for the next day. As for heat, I've been going in August for years now and have never had a problem. Sorry this is so long, I didn't mean to ramble!! Hopefully I can help some of you.
Enjoy The Magic!!