Thanks. I ordered the Frio. I also got a waterproof fanny pack type of thing. She'll also have a bag for her clothes that's waterproof and floats. The camp will have a cooler. DH spoke with the director, and they've had experience in handling EpiPens for campers. We drive down tomorrow, and camp starts on Sunday.
It's good to know about the Frio. She has a couple of field hockey camps this summer (one is a 4-day sleep-away camp), so the Frio will be helpful then.