Fear the Lord - Piety
Recognize his maker, reverence the Lord - bow down lowly
Depart from evil - Morality
The outcome of piety is morality, change of circumstance, turn from the world
It shall be health to thy navel, and marrow to thy bones - Health
Health and strength to your body (naval) and frame (bones)

Maybe you are "dry" today spiritually because you let the world get more of you, drowning the thirst you once had for the Lord. You can't seem to see God's goodness around you, you find yourself angered easily, you get the point. It isn't because God has moved, you have. This movement has caused you to "dry up", your bones to ache, your body to shrivel in thirst. You have the "potion"...the word of God. Draw near in fear for He is and always will be of goodness, drink of the living water for His blood was enough, with this turn from your evil ways (the worldly ways) and look back to Christ. It will heal your body, it will give you drink, and nourish your bones once again.