Bukkit/Bukkit — comment on commit c80b2d2fd999edc682e855f9e110f23861e6c2e5
File:  line 0
By Acrobot:

@EdGruberman
The potions can already be given directly with current command, but you need to know their metadata.
You can find it out on sites like, for example, http://www.minecraftinfo.com/IDList.htm