Mechanics and beginner questions. Please help if you can.

Hey guys. I just bought this game, and there's a few questions I was hoping someone with more knowledge may be able to answer. I've tried searching for them, but I may not be searching the right keywords or the answers are really outdated. If you can help answering or point me to somewhere I can get a concrete answer, it would be much appreciated.

1) Does water do anything mechanically (ie: improve crop harvest, etc.) or is it only a visual thing at the moment?

2) Sometimes my hearthlings would be in the middle of building something, then they just stop to eat/sleep/whatnot, but never return to finish building the structure. I've tried deleting/removing part of the building, pausing and unpausing the building process, reloading the game, but nothing seems to work.

3) What does Mind, Body, and Spirit do? I've read that high spirit and body makes your character have more health or less likely to flee during combat scenarios, but is this explained by the devs anywhere or is it all just assumptions at this point?

Thanks for your time!