You use it to gain experience points in creative mode, you can only get it in creative mode, but then you can switch to survival with cheats.
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i think its called bottle of enchanting, or bottle of enchantment.
/Give {username} 64 384 Gives Username 64 bottles o enchanting
In vanilla survival, you can not brew the bottles. The only way to get them legit is to trade with a villager.
If you were playing 1.2.5 and lower, then you can use the bottle o' enchanting. As of 1.3.2,and up, you can enable cheats and do the /xp command.
Enchantment tables are crafted like this: (Key: B=Book D=Diamond O=Obsidian N=Nothing)1st row: N B N2nd row: D O D3rd row: O O O