- Add Misc Bags of Holding component adds items to the stores, and
- Exotic Items Pack adds items to areas/loot/containers.
<s>Okay, here's an answer to your question in short.</s> BG2Tweaks adds a short script to the area in question:
I am totally not sure about IWD2 - about the only mod I know for this game would be IWD2 NPC, but maybe trying the above action(or just adding it to a store, or to a quest-giver, after all) might work.
Edited by Kulyok, 27 May 2013 - 09:39 PM.