Exodus 15:23-24

23When they came to aMarah, they could not drink the water of Marah because it was bitter; therefore it was named Marah.
 Marah means bitterness
24And the people cgrumbled against Moses, saying, “What shall we drink?”

Exodus 17:1-4

Water from the Rock

1 dAll the congregation of the people of Israel moved on from the wilderness of Sin by stages, according to the commandment of the Lord, and camped at Rephidim, but there was no water for the people to drink. 2 eTherefore the people quarreled with Moses and said, “Give us water to drink.” And Moses said to them, “Why do you quarrel with me? Why do you ftest the Lord?” 3But the people thirsted there for water, and gthe people grumbled against Moses and said, “Why did you bring us up out of Egypt, to kill us and our children and our livestock with thirst?” 4So Moses cried to the Lord, “What shall I do with this people? They are almost ready hto stone me.”
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