Thank you all for the tips!
I'll get some good quality potting mix.
It sounds like a lot of growers like clear pots to allow some sunlight in and to monitor the health of the roots.
I'd prefer a glass pot over plastic (trying to reduce my overall plastic consumption after learning that
<10% of all plastic has ever been recycled).
From the "Clear Container?" thread, it seems glass might not allow for the same circulation as plastic.
Would it help if I put some rocks at the bottom of the glass container to improve circulation?
Another more existential question: what is the purpose of an orchid pot and medium if they are actually epiphytes? Simply to support the orchid so it can sit on a surface without toppling? Or does close contact between the roots and medium help the orchid absorb nutrients and retain moisture?