What your after is the psilocin citrate, not the citric acid. Psilocybin converts to psilocin citrate (in acidic water), and the psilocin just becomes a different salt (citrate). The only way i know of that would get you citrate mushroom alkaloids would be to evaporate it. But being how fragile psilocin is, i would worry about it getting oxidized or degraded simply by letting it evap with no heat. If you do try to evaporate the water, do it in a dark place, with no heat. I don't know if you will get active psilocin citrate, but its worth a try. Perhaps using fumaric acid would result in a more stable salt that could take a little more abuse, and not oxidize to something inactive when you evaporate it.
I doubt freezing or acetone bombing the tea will do much, being that psilocin is potent (35mg dose) and would require a very small amount of water for it to precipitate out of.
Good luck though, extracting mushroom alkaloids seems like it would be fun and interesting, being that you would have to fiddle around and expirement to devise a kitchen tek that could result in psilocin xtyals.
"let those who have talked to the elves, find each other and band together" -TMK
In a society in which nearly everybody is dominated by somebody else's mind or by a disembodied mind, it becomes increasingly difficult to learn the truth about the activities of governments and corporations, about the quality or value of products, or about the health of one's own place and economy.
In such a society, also, our private economies will depend less upon the private ownership of real, usable property, and more upon property that is institutional and abstract, beyond individual control, such as money, insurance policies, certificates of deposit, stocks, etc. And as our private economies become more abstract, the mutual, free helps and pleasures of family and community life will be supplanted by a kind of displaced citizenship and by commerce with impersonal and self-interested suppliers...
The great enemy of freedom is the alignment of political power with wealth. This alignment destroys the commonwealth - that is, the natural wealth of localities and the local economies of household, neighborhood, and community - and so destroys democracy, of which the commonwealth is the foundation and practical means.” - Wendell Berry