The manna (“spiritual food”) and water which sprang forth from a rock smote by the rod of Moses (“spiritual drink”) were all supplied because of His supernatural intervention. The quoted rabbinic tradition gives us literary imagery of a flowing rock that lingered in the presence of the Israelites with the intention of enforcing the point that God continually guides our experiences.
The rock reference is a typology of Jesus Christ, namely of His bold character and propitiatory sacrifice for the salvation of those who believe on Him. He is life to us. All things consist because of Him. He is the same Spiritual Rock and Lord who governed the nation of Israel (Deuteronomy 32:3-4; 39; 1 Samuel 2:2; 2 Samuel 22:32), and overthrew the people who put Him to the test (Deuteronomy 6:16; 1 Corinthians 10:9).
Jesus Christ is co-eternal with the Father. He is God in the flesh. He possesses the fullness of His eternal glory. See also John 1:1-3.