Glass globe terrarium help take 3

[littleflower]

Sorry for all the posting, Wi-Fi issues. Anyway, I have two glass globes, see below... Would like to plant some orchids in them. I have looked throughout these threads and I see more complex set ups, I am looking for simple. Online I see that some people are using charcoal, Spag moss and pebbles in the bottom. My main question is how to water and get good drainage, or is misting enough? this will be sitting in a south facing window, partial sun during the day. I do have some plants ready, two out of four are on the approved list. Thanks so much!

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