Sacred Haven of Debauchery

It seems the guard himself stole the water (I checked his inventory using the "steal" ability).

Considering he should have his own supplies, plus the fact that he's the one distributing water to others, the logic is simply brilliant.

Then I went to all the cities. This silly girl still hasn't been kidnapped by the raiders... maybe because I killed them? =\

Yes, that's why.

and yes, a member of the Children of the Cathedral appeared in this city.

Unexpectedly, I'll commend you for your observation skills; many people replayed the game several times but didn't notice him, including myself. He's not related to any quests, but he gives a general idea of the... expansiveness, if you can call it that, of this organization. If you look near that house, you'll find out that an ordinary citizen used to live there, but now he's been kicked out. By the way, Ar, be honest, do you like the Children of the Cathedral? After all, they are so kind, and the high priestess in the Hub is a girl <3.

Then I went down to the Hub and visited the creditor. But he's angry because I killed Decker. He attacked, and he paid for it. I took some money from his safe.
Now I want to join a caravan...

Why? You should have more than enough money to live on, so go ahead and embark on new adventures.