I am sure many growers have attempted their own "special brews" but unless you are a chemist, knowledgeable on the nutrient needs of orchids, why would you bother?
There are several excellent fertilizers on the market, many good ones and a goodly number available online. If you wish to add amendments, that is a personal preference, but most fertilizers are complete and need no other additives for the hobbyist grower.
I suggest you click the Search icon on the menu bar of this Forum, type Fertilizer needs of orchids and browse at your leisure. There are more formulas out there than ants in an ant hill. but you would be best served if you learn what orchids need and when they need it before you start "brewing".
Cym Ladye