Make your own? Corn syrup and red food coloring. Add flavors if you want. Peppermint? Cotton candy? Strawberry? Those flavor oils from hobby lobby will work. Fill empty capsules, might have to play around with the capsule to find easy to break or crush.
https://www.amazon.com/Capsules-Express-Clear-Empty-Vegan/dp/B07X5N553Y
They do have vegan fillable capsules on the market. BTW, I take Prazosin but never considered the makeup of the capsules. I'm guessing prolly porcine or bovine. Time to make a change, I guess.
I just buy the capsules from Amazon: https://www.amazon.com/Capsules-Express-Clear-Empty-Vegan/dp/B07X5N553Y/ref=sr_1_7?dchild=1&keywords=capsules&qid=1598132346&sr=8-7
You will need to source the mushrooms yourself of course. Once they're dried up just grind them up. You can use a coffee grinder, weed grinder, blender, or mortar and pestle.
The container is also available on Amazon: https://www.amazon.com/Genius-Mushroom-Cordyceps-Nootropic-Supplement/dp/B078SJ9F5S