Some people say that boiling the mushrooms destroys the psilocybin. But I have used the following tea method loads of times with no noticeable lessening of affects.
1. Put a few cups of water into a kettle.
2.Chop up the mushrooms, grinding them can make it hard to retrieve all the material.
3.Add the mushrooms to the kettle.
4.Press the boil button, keep the lid open. When they start to heat up nicely, it will start foaming up.
5.Turn off the boil button before the foam overflows, close the lid if need be.
6.Stir the mushrooms and let the water cool down.
7.Leave it to simmer for about 15 minutes whilst stirring.
8.Repeat the heating process and pour into a mug through a civ or other filter with tea, lots of sugar and then add your milk.
You should end up with a grey tea.
Note that I was using Psilocybe Semilanceata and they were wet every time. I found that tea can be alot more potent, always comes on alot faster for me but this add's to the come up shakes and anxiety. Most times I'm thinking 'Why did I do this?' at the start but it goes away after about 20minutes. Using the tea method I've never been able to push the trip past 4 hours no matter how many mushrooms I use.