65-70 C, going over 80-85 C will damage the muscimol.
as far as I know, muscimol is pretty stable. I don't think 80°C will do much damage to it.
WRONG and WRONG.
1. I have read in hundreds of places that ibotenic acid IS INDEED a sickening dysphoria-inducing substance. I have no idea why you "think" it is benign.
2. Simple drying does NOT convert it sufficiently to Muscimol. Water and mild heat are REQUIRED to change all the ibotenic acid to musicmol which is THE ESSENTIAL KEY to transforming Amanitas from a head-spinning vomit fest into an otherworldy lucid dream inducing psychedelic dissociative.
so we agree that we want to convert the ibotenic acid to muscimol, right? this is definitely desireable, because muscimol has more psychedelic properties than ibotenic acid, and also muscimol is much less toxic than ibotenic acid.
I have never said that ibotenic acid is "benign", btw; all I have said was that its neurotoxic properties are irrelevant, because it cannot pass the blood-brain barrier. the neurotoxic properties of ibotenic acid were found in experiemnts where neurons were directly exposed to this compound. in short: if you just eat ibotenic acid, it will most likely not lead to brain damage, because it cannot cross the BBB. it might be toxic otherwise, though.
but now to the really important part: decaboxylation means removing carbon dioxide, and I am pretty sure that this is induced by drying, and not by adding water. I'm a bit confused now, unfortunately my chemical knowledge here comes to an end. hopefully, someone with more chemial understanding than me can help clear this up.
for the time being, I can just give you my personal experience with amanita muscaria: all I did in preparation is drying it with heath, making sure there is absolutely no moisture left. then I grounded the mushrooms to a powder and ingested them. 18g of amanita muscaria powder prepared this way lead to an extremely powerful psychedelic experience that was difficult because of its outherworldness, but it was completely benign on my body.
btw. I also remember to have read somewhere that it is important to not use carbonated drinks for ingestion, because this might lead to the backwards conversion of muscimol to ibotenic acid. this was quite hard for me, because I like carbonated drinks very much, and I drink lots of them; on the other hand, the fly agaric powder prepared my way had a really really disgusting taste (it was the most disgusting thing I ever ate), and therefore it was really difficult to gulp it down. now, usually I use coke for gulping down disgusting stuff, and this works quite well, but this was not possible in this case, because of the carbon dioxide in coke. and so I had to swallow my disgusting fly agaric mushroom powder with tap water. this was a real hard exercise in self-control, but I managed it, and I was rewarded with one of the most intense entheogenic experiences of my lifetime.