What did God do when the the people complained about the lack of food and water during the Exodus from Egypt?

He sent fiery serpents to bite them.

And the people spake against God, and against Moses, Wherefore have ye brought us up out of Egypt to die in the wilderness? for there is no bread, neither is there any water; and our soul loatheth this light bread.

And the LORD sent fiery serpents among the people, and they bit the people; and much people of Israel died. Numbers 21:5-6