Since no one else answered.....
Fresh amanitas will start to rot after a week or so just like any other mushroom. They'll last a little longer in the fridge, in tupperware with the lid cracked (not airtight). Dried, they'll last forever.
Pedro snot tea will also last forever in the fridge in an airtight container. (I have 2 "Sobe" bottles full.)
Huasca, I'm not so sure....I usually make it no more than 2 days in advance. I have had some stuff that didn't get used and sat in the fridge for a couple months, caapi vine wine and mimosa juice. The caapi vine smelled the same after 2 months but tasted much worse- I threw it away. The mimosa, upon opening the jar, stunk up my entire house so it was also thrown away. So I don't know if either of those would still be active but I wouldn't risk it. Best to make this stuff fresh.