No. You can buy small prep packets from JPI while learning.
Biodynamic is organic plus the nine preparations and moon‑phase timing.
Yes. Adjust water in sprays and compost moisture as shown in the checklist.
Hand stirring builds the needed vortex, but a flow‑form or small motorized stirrer also works. The vast majority of the benefits of the stirring occur in the first twenty minutes, but given how infrequently biodynamic preparations need to be applied each year, it is not a lot of time.