How much XP can a Bottle of Enchanting give?
From the wiki:
A bottle o' enchanting can be thrown by pressing use. On impact it will drop experience orbs worth 3–11 experience points.
If you are curious about how many points it takes to level up, each level you increase requires even more points to advance to the next level. Here is a table on the wiki. Unfortunately, 3-11 points is not very much.