Why does miss Sullivan repeatedly spell water into helens hads while pouring water over them?

Miss Sullivan repeatedly spells "water" into Helen's hands while pouring water over them to create a concrete association between the Word and the substance. This method helps Helen understand that Words represent real objects and concepts, bridging her isolated world of silence and darkness. By combining tactile and sensory experiences, Miss Sullivan effectively teaches Helen the power of language and communication. This moment is pivotal in Helen's journey toward understanding and learning.