Alec uses the faucet to call for his companions.
Alec's Note is a written note found in Dishonored.
Transcript[]
Wait here and stay hidden until I come back, I have one last thing to do on the other side of the drawbridge. I need to deliver all these pearls we gathered to the boss tonight, so don’t be messing around.
If something goes wrong with the guards or if anything else happens, use the sink next to the building and speak loud. The boys will come running to help.
--Alec
Location[]
It can be found in the room at the north end of Kaldwin's Bridge where two Bottle Street thugs are protecting a case of pearls during the mission The Royal Physician.