Answer: The main purpose of the text provided is to (1.) entertain.
Explanation: The text provided follows the narrative mode of writing since it recounts different events related to the relationship that the speaker's grandad had with water. In that way, the speaker intends to entertain the readers and to make them keep reading by telling a story. Therefore, the purpose of the text is not giving orders/instructions nor convincing the reader to do something or to act in a particular way.