What does Lennie do with the water that makes him proud of himself?

In the opening scene of the novella, Lennie and George arrive at a peaceful pool where they drink refreshing water and camp out for the night before traveling to the ranch. When Lennie and George initially arrive at the bank, both men drink the cool water from the pool. Lennie cannot help himself and dunks his entire head into the water. As George is examining the river and searching for a current, Lennie begins to wiggle his fingers in the water to make small waves. Lennie is enthused and entertained by the tiny waves and says "Look, George. Look what I done" (Steinbeck, 2). Lennie's reaction to making waves and tiny splashes illustrates his simplemindedness. Lennie is genuinely excited and proud of himself for making small waves with his fingers. While Lennie plays in the water, George chastises him for drinking the water without checking to see if it is stagnant or running. Early on in the novella, Steinbeck depicts George as Lennie's keeper who guides and takes care of him.