In this excerpt, I found the motifs of dry/wet, and desire frustrated. The concept of only having rocks available and no water could be symbolizing how in this spiritual waste land, there is no hope or beliefs that are able to grow and develop. Water signifies purity so for there to be no water and only dry rock, it is difficult to find said hope. The desperation for need of water really comes through with the narrators voice. While he is waiting and wishing for accessible water, he says "amongst he rock one cannot stop and drink" I take this line to mean that if someone were to need a drink of water it compares to people overthinking and how both of those things don't occur in the waste land.