Hi redscorpion!
I don't believe it matters who actually gives the elixir to Mekdawa though usually there is no reason to switch the potion from one character to another. The character who had the quest does have to be selected when you go back to the temple to get credit for the quest. You can check the character's journals to see who has what quests going. You also need to wait for the NPCs to finish (completely) their speeches to actually get credit. I learned that the hard way when I was trying to complete the Paladin quest. I knew I had done everything correctly but was not getting promoted. My problem was that I didn't wait for the NPC to finish talking before I did something else.
If you have any more trouble with this particular quest, you can email me or Xignal a copy of your gamexx.sav (ZIPPED) and we can see if we can't figure out why you are having difficulty. It shouldn't be this hard.
Wyv
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