My Immortal Is Actually a Mortal

He retreated to the mountains just to live a simple life and learn true cultivation. What he doesn't know is that his mundane junk holds godlike power: his mutt terrifies grandmasters, his expired pills are hailed as holy elixirs, and his plastic watering can extinguishes hellfire. After he saves an injured girl, powerful sects mistake him for an all-mighty deity and line up to bow before him. With masters treating him as supreme, how can he confess he has no idea how to cultivate?