No issues with drinking organic apple cider vinegar, Bragg's or our store sells a less expensive one.
It sounds like the subject at the message board mainly took capsules.
Kim chi, yogurt, etc. all offer probiotics from what I understand along with some other exotic foods, tempeh I believe is fermented soy. Ferment soy is good for you; straight soy is up to the individual I would say. Then, there is whether one wants to go organic.
https://en.wikipedia.org/wiki/Tempeh