(Ibid. 24) "And the people caviled against Moses, saying: 'What shall we drink?'" R. Yehoshua says: They should have taken counsel with their leader (Moses) first as to what they should drink. Instead, they took him to task. R. Eliezer Hamodai says: Israel were "conversant" in complaining against Moses — and not only against Moses, but also against the Omnipotent!
What Shall We Drink? Rabbi Joshua Takes the Generous View the People
Mekhilta Tractate Vayassa 1:12