Exodus 7:21

7:21 When the fish that were in the Nile died, the Nile began to stink, so that the Egyptians could not drink water from the Nile. There was blood everywhere in the land of Egypt!

Exodus 15:23

15:23 Then they came to Marah, but they were not able to drink the waters of Marah, because they were bitter. (That is why its name was Marah.)

Exodus 17:1

Water at Massa and Meribah

17:1 The whole community of the Israelites traveled on their journey from the Desert of Sin according to the Lord’s instruction, and they pitched camp in Rephidim. Now there was no water for the people to drink.