Just eat the mushrooms, why make tea? I don't see the point in making tea. That's just exposing the psilocybine to a high temperature. If possible, dry your shrooms (takes one or two days, there are methods to speed up the process), measure them carefully and just eat those.
Abstaining from water is stupid. Don't ever do that again when there are shrooms in your house, because if you pass out and/or die, they're gonna blame it on the shrooms again and we're all fucked. If you wanna do some weird food and water fast, do it another time, not prior to a trip. Just eat fruits and drink water & juices on the day of your trip.
I know people who use or have used anti-psychotics, and they can generally handle psychedelics quite well. But be VERY careful. Make sure an experienced psychonaut is there with you during your trip, and plan everything in advance.
But from what I've read so far, you do seem to have some weird points of view. That, rather than the point that you've been on medication, makes me wonder if psychedelics are really the thing for you. But it's ultimately up to you. As Timothy Leary said:
"Acid is not for every brain - only the healthy, happy, wholesome, handsome, hopeful, humorous, high-velocity should seek these experiences. This elitism is totally self-determined. Unless you are self-confident, self-directed, self-selected, please abstain."