The feature described on this page currently only works on the 1.12 version of the server.
Bottles O' Enchanting have been changed to guarantee 7 XP per bottle instead of random 3-11 in normal minecraft.
You can now craft Bottles O' Enchanting by using a brewing stand and a beacon.
To get started right click your brewing stand with a beacon, you'll then be able to add experience when interacting with the stand.
The recipe for making Bottles O' Enchanting is Thick potions and player levels. One bottle will be produced per level.