Requiring more water does not mean their water content is necessarily higher, it means that they urinate more, and/or (more probably) there skin is less efficient at retaining moisture.
This seems a bit garbled.so the tending to trufflefolk buds are also much time consuming.
Under "Languages" in the less crunchy part you say they speak Burble, but that isn't listed in the more crunchy part. Is "Burble" the campaign specific name for Myconoid? I didn't know myconoids could even speak verbally...
I think that you should at least give more in-depth roleplay tips for how a PCs personality should change after the first time they take damage.