Depressed that my favorite inventory restocking addon, SteelYourCarbon, seems to be borked currently, I decided to make my own in the form of a WA.
Simply enter in the ItemID and desired amount into the Action - On Init area in the following format:
aura_env.WArestocklist = {
[itemID1] = desired amount,
[itemID2] = desired amount,
}
Then when you visit a vendor that sells one of those items, it will buy exactly enough to bring you to the desired amount. Its great for keeping stocks of food and water (or any vendor item you want to keep handy) in your bags before you head out questing.
To prevent accidents, it will automatically ignore any item that uses an alternate currency, like Bloods of Sargeras.