This quest, like most quests in this questline, is quite simple. Talk to Lexi on the Tempest after completing "The Journey to Meridian", then return to the Nexus. Talk to the General Merchant on the Docking Bay/Common Area level and buy a bottle of Akantha from her for a mere 10 Credits. Isn’t it funny how each of these ingredients seems to end up costing 10 Credits? Anyways, return to the Tempest with your prize and present it to Lexi, who will make a bogus excuse about the purpose of the alcohol before hiding it away.