"Pitcher pumps are used to fetch water and other liquids for delivery to buildings."
The Pitcher Pumps producing manually transported liquid bottles are very important buildings and available from the beginning. They pump bottled version of any single Liquid their roots reach only.
See Bottle for more information."
Once built, a Pitcher Pump will extend its roots down until it reaches an obstacle or 4 tiles in length. The roots can not be overlapped by other buildings, can extend further down if there are new available space and can not shrink.
The "Liquid Available" status only shows total amount of liquid in tiles that one pump's roots reached, not of whole body of liquid.
Manually transporting liquid via bottles don't require filtering task.