[Merchant Buying]

I am trying to make a merchant who doesn't sell anything and buys only skooma. Making him not sell anything was easy. The problem is making him buy only skooma, because right now, as skooma is a food vendor item, he will buy food and raw food including skooma. I tried and failed to edit the vendor list, so is their a way to make him buy nothing but skooma?

[Skyrim Creation Kit Assistance]

I am trying to make a follower with the creation kit. My follower is an alchemist, so I'm trying to make her give me lesser healing potions. Since I can't script, I'm not sure how to go about this. Since I am quite inexperienced, I am even having trouble with making a dialogue option appear to use for asking for the potion. Any help is appreciated.

[Creation Kit Problem]

I was making a mod for Skyrim which I released on steam. I had a very small dungeon and in the process of making it larger while testing I found a major bug - most of the enemies that I had placed were disappearing, and when I left I discovered they reappeared at the exit, already dead. The ones who didn't disappear were sitting down, but some of the sitting ones did disappear, and it was only those linked to useable objects, I tried linking skeevers, who can't sit, to the floor, but nothing changed. I am extremely new to modding, and the tutorial I watched I followed very well, but this didn't happen and it is very strange. To create the dungeons cell i duplicated aaamarkers and removed the big red thing, then made my dungeon, which was nordic, from scratch.