You need to unlock the 'Lifeline' upgrade from Eperin to be able to access the bottom of the well and unlock the upgrade, thank's to SquashMyMouse for providing this information.

From this place, go bottom left to find a waterfall.





Then go through the waterfall.



You can go down until you find a small island with a well.



Go inside and you should find the gift on the floor.



That's it, hope you will enjoy trying this new gift.