you could also use MHRB and syrian rue.... now i dont know if this is authentic ayahuasca but its certainly effective

syrian rue - 3grams taken ground in capsules or made into a tea

mimosa hostilis -  7 grams boiled in 4 cups of (3 parts water 1 part lemon juice) for however long it takes to get down to one cup.... (note light boil not a rolling boil) then strain and simmer to reduce to about a half a cup this in then drank

take the rue about 20 mins before the mimosa expect nausea and a mild-strong lsd like trip

those ratios are for one dose i have had strong trips from mimosa tea made in this fashion i have always taken the syrian rue by gel cap ground... i have never puked from this concoction but i have seen people that have i am not normal when i say expect nausea .... EXPECT NAUSEA

ebay is an excellent source