Our center is run in a traditional (Shipibo) fashion, ceremonies are at night (8p until about 1a). For preparation...it's definitely good to clean up your diet but the only major things to avoid are contraindicated medications; backing off from recreational drugs and alcohol for a bit prior is a good idea too. It's good to stop caffeine just so you aren't withdrawing for a few days while here as well. (Many places are overly strict in terms of this stuff. If you come for a master plant diet, you're getting a vomitivo/purgative at the start to clean you out regardless).
