I change the water every night when I feed the colony, because they won't drink water that's been lying for more than 1 day. When it rains, I don't bother much because they prefer the puddles. In summer, they prefer to drink from the air conditioning draining pipes, so the water I leave them will be mostly untouched.
The Royal von Meouw Dynasty: His Royal Highness the late Prince von Meouw,
Her Royal Highness Princess Gatita von Meouw, Nikita Duchess of Meouw and
His Highness Cuchi-Cuchi, next in line for the throne of Prince von Meouw.