We were a no meds camp for over 10 years. As the camp is for free for impoverished and abused kids, this means a LOT of kids never got a camp experience. I tried for 8 years to allow meds and finally won with the director.
We use the "bingo cards." Parents are mostly on pharmaceutical assistance programs and we've had no problems getting approval for a week's worth of meds packaged this way. The local pharmacies all help us out and usually provide the packaging for free. Each pharmacy may have only 5 or 6 kids that go to camp so it's not a huge expense for them but a great community service.
There's a separate card for each dose (e.g., if the med is BID then there are two cards). There are drawers for each time and we arrange all the kids meds so that everyone is getting their meds (other than prns) at the same time so that we don't spend 12 hours a day passing meds.
If a kid shows up to camp with a properly labeled Rx bottle, he/she still comes to camp without the bingo cards. I tape the bottle to a blank card and stick it into the proper slot and simply dispense from the bottle.
We've never had a problem. I've had complaints from other nurses who were used to not having meds, but this all about the campers NOT the nurses.