Speak with Kesh's assistant, Wilma, outside Kesh's office after visiting Kadara during "Hunting the Archon".
Get beer from bootleggers at Kadara PortEdit
Close to the navpoint in Kadara Port is a datapad on a crate. On it is a message leading you to the new site down by the acid ponds. You get a navpoint to the new location.
Find the bootleggers' operation on KadaraEdit
Go to the navpoint. On Kadara, in the acid ponds, not far from the outpost site in the central western area of the map, is a parked shuttle. If you get close enough, SAM will remind you that Kesh's assistant asked you to acquire beer. Simply speak to the merchant and the quest completes.
You receive an email after the task is complete.