What did Elijah have poured over his offering and the wood on Mount Carmel?

Answer: Water

Elijah had four jars of water poured on the offering and wood three times, until water filled the trench.

“and said, “Fill four waterpots and pour the water on the offering and on the wood.” “Do it a second time,” he said, and they did it a second time. “Do it a third time,” he said, and they did it a third time.”— 1 Kings 18:34 (BSB)