I am a little more laid back, on treatment approach, I would give them the baking soda a couple of times, and I wouldn't be surprised if they scour for a coulple days. At this point I think you are safe as far as falling over dead from bloat, That would have happened by now.
My buck was accidently fed the wrong hay this winter and he went off feed for 3 days, most certainly had an upset stomach, not very bloated looking, and honestly I just gave him time to feel better,
I wouldn't expect the runny poop to continue more than 48 to 72 hours, after that I think I would wonder if the stress from having upset stomachs, caused a worm load issue on top of everything else, or a bacterial issue in their stomach,
Spectam scour halt is an excellant medicated drench for bacterial scours. Available at feed stores/tractor supply company. I think it goes by a slightly different name these days.