Moses
Exodus 17:3BSB·traditional attribution

But the people thirsted for water there, and they grumbled against Moses: “Why have you brought us out of Egypt—to make us and our children and livestock die of thirst?”

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The strait that the children of Israel were in for want of water; once before the were in the like distress, and now, a second time, Exo 17:1. They journeyed according to the commandment of the Lord, led by the pillar of cloud and fire, and yet they came to a place where there was no water for them to drink.

Commenting on Exodus 17:1-7

John Gill Reformed Baptist @doctorgill

And the people thirsted there for water,.... They saw there was no water when they first came thither, and therefore chid Moses for bringing them to such a place, where they could not subsist; and having stayed some little time here, and all the water they brought with them from Alush being spent, and having none to drink, began to be very thirsty: and the...

Adam Clarke Methodist @methodicalclarke

And the people murmured - The reader must not forget what has so often been noted relating to the degraded state of the minds of the Israelites. A strong argument however may be drawn from this in favor of their supernatural escape from Egypt. Had it been a scheme concerted by the heads of the people, provision would necessarily have been made for such exigencies as these.