The water is heavily mineral laden but otherwise seems potable. You poke around a bit and Skeeve probes for any magic but comes up with noting standing out. Finding nothing other than the small stream you continue on winding south, back east, then south again.
The passage opens up into a large cavern again. (5) This cave also has a high level of moisture but this time you do not see a clear source though there is a large pool of what might be water. It is hard to tell much about the cave be due to the thick covering of bright pink slime spread throughout the cave. The slime looks to be some type of mold, plant, or fungus and covers all surfaces making the entire area pink. The pool of, whatever, is similarly pink but the surface ripples and the reflected torchlight catches your eye as you move around.