You can get the Water trait in Dungeon Village 2 for your city by building Stream or Morning Glory, taming Orblob or Dragtoise as pets and hosting event Sea Training. Well, Public Bath, Orblob and Dragtoise are worth 10 points, which are the most points for acquiring the Water trait.
The Water trait is a requirement for one titles, including Sub Zero.
The exact contribution of points for each factor in the Water trait is detailed below.