They flowed in channels which God provided for them, and followed the Israelite's in their march, as is noted, 1 Corinthians 10:4. Hence they complained no more of want of water till they came to Kadesh, Num 20, which was many years after this time.
Related Commentaries of Psalms 105:41
Psalms 105:41
41 He opened the rock, and the waters gushed out; they ran in the dry places like a river.