When you get to the lake and realize you forgot your waterproof EpiPen case... You drink an entire water bottle and put your EpiPens inside (in their usual zip top bag) and tie it to your swimsuit. Perfect solution!
And, always research your destination, even if it is within a city with emergency rescue nearby. This lake was an abandoned quarry full of water. It was fun and beautiful and lovely, but unless there is an access road that doesn't have a permanent and thick solid steel gate (people crawl through an opening to gain access), no vehicles could get near the lake. It was a 1 km hike after that gate too, so not the best place for someone who could require emergency medical attention. My guess is their response would have to be by helicopter... Or some sort of off road or bicycle rescue team. Unless they have a key to the gate. Scary to think about. I didn't eat anything or sit near anyone with food.