They should do fine with the horizontal nipples. Watch them and see if they are swallowing after hitting the nipple, then you know.
Yes they are getting water from feeding fermented, even when it's on the dry side. I never feed fermented very wet, it's like biscuit dough/ mashed potatoes, my chickens don't like it real wet.We're doing a fermented feed that is barely moist (not the wetter stuff) so I'm wondering if they're getting their water from that.