I've thought about EB,
or a water reservoir IN the bucket, like no holes in the bottom 1" ...
Or maybe sitting the bucket on a shallow saucer ...
and maybe embedding a few strips of cotton cloth in the mix as wicks ... ...
... maybe next year.
Probably I'll rely on drippers and a timer, watering automatically 1-2 times per day and expecting to get some flow-out one or both times. I thibnk ther biggest watering variable will be how much and what kinds of fines I add to my (medium & coarse) bark nuggets. I don 't reallty wnaty to go hydxroponic, but I guess a soiless potting is by defi9nition hydroponic.
I've had enough mid-summer Bok Choy poop out or go to seed that I may put 3-4 plants in raised beds (and a little less light) and just 2-3 plants in buckets. Not enough buckets for a controlled study.
At first I thought I would have 4-5 plants in buckets.
Now I'm leaning toward NO oyster shell grit, eiother a little cruished stone I have or rely solely on the colarse bark for drainage.
Maybe some dolomite lime. Probably a bit of 16-16-16 dry fertilizer to go with the mostly Miracle-Gro fertilizer. Maybe-probably put some of my compost in one bucket.
