What you need:
1 accurate scale
1 coffee grinder or morter and pestle
2 jars with tight fitting lids
1 bottle of everclear (or other high proof drinkable alcohol
1 funnel
2 coffee filters
The process:
1. Weight out a known amount of mushrooms (say...10 grams)
2. Grind them well with morter and pestle or coffee grinder
3. place mushrooms in jar #1, cover with ~1/2 to 2/3 cup of everclear and tighten the lid
4. Let this mixture sit for 24 hours in a cool dark place, shake every two hours or so
5. get a coffee filter and funnel, place funnel over jar #2 and filter the mushroom slush
6. Squeeze the leftover mushroom gunk gently so that you get as much alcohol out without ripping the filter.
7. Cap jar #2 with the alcohol in it and put it in the fridge
8. Put the mushroom gunk back in the jar #1 and put in more everclear
9. Repeat step 4
10. Filter again into jar #2 (dont' forget to squeeze the gunk!)
11. Take the jar #2 with your mushroom alcohol in it and put it in a cool dark place with a small fan gently blowing on the surface. This will evaporate the alcohol and you'll be left with all the mushroom "goodies" in the jar
12. Measure out a precise amount of everclear using a syringe, for 10 grams I would use 40 CC's
13. Squirt this into the jar with your mushroom goodies and gently swirl it till everything is dissolved.
14. You now have a mushroom extract/tincture that will dose at 0.25 grams/1 cc. Take a small test dose so you know the strength before you go all out.
To prolong the life of your extract, put it in a small of a jar as possible (less air space=better) and store it in the fridge or freeze. It should last several months this way.
Be safe.
Peace, Love, and Knowledge