Thanks for your help. I will plan on talking to the guides on the trip to find the springs.
I have looked around and still may make my solar set up with UV pasteurization to avoid the need to bleach/iodine/tablet the water. I would rather not have to deal with bleach water. The main reason is the ability to also use the solar system to charge camera batteries on the river with the same setup.
I probably won't have the funds to attempt this project till next summer though. Once I do I'll make sure to take lots of pictures and do a full write up.