Wow, that made me travel back in time.
I experiences it nearly 20 years ago in the same area.
We harvested and cooked the brew ourselves. We also prepared our bodies with Guayusa and eating almost nothing before. I still, after 20 years, have the feeling that it changed my life to the better. I'm not a happy person but it gave me something that is deeper than happieness or other human feelings.
I'm pretty sure, if every human experienced this once, we'd have a better world.