For the feeders, the two key entries in the config notecard are:
 
Code:
FOODTOWER=SF Bulk Storage
 
   and
 
This defines what food item it will take from which storage.  So in the above example it will try to take 
SF Slop from the nearest 
SF Bulk Storage item whenever the food in the feeder gets to 4% or below. 
For water it uses the entries:
 
Code:
WATER_TOWER=SF Water Tower
 
  and