EXP Bottling allows the player to store their own XP in bottles using the EXP Bottling Machine.
All you need to do is click the machine and add a bottle. The GUI has a calculator to add as much XP as you want to a bottle up to the amount you have available. You can even stack 64 bottles at a time for faster output.
And once the bottle is full it can be stored, traded or you could drink it right away to put the XP right back where it was.