Dreaming Water is an exploration of two of the richest and most layered human connections that exist: mother-daughter and lifelong friends. Hana is suffering from Werner's syndrome, a disease that makes a person age at twice the rate of a healthy individual: at thirty-eight Hana has the appearance of an eighty-year-old. Cate, her mother, is caring for her while struggling with her grief of losing her husband, Max, and with the knowledge that Hana's disease is getting worse by the day.
Hana and Cate's days are quiet and ordered. Cate escapes to her beloved garden and Hana reads and writes letters. Each find themselves drawn into their pasts, remembering the joyous and challenging events that have shaped them: spending the day at Max's favorite beach, overcoming their neighbors' prejudices that Max is Japanese-American and Cate is Italian-American, and coping with the heartbreak of discovering Hana's disease.
One of the great joys of Hana's life has been her relationship with her beautiful, successful best friend Laura. Laura has moved to New York from their hometown in California and has two daughters, Josephine and Camille. She has not been home in years and begs Hana to let her bring her daughters to meet her, feeling that Josephine, in particular, needs to have Hana in her life. Despite Hana's latest refusal, Laura decides to come anyway. When Laura's loud, energetic, chaotic world collides with Hana and Cate's daily routine, Hana has a chance to reconnect with this troubled woman after a long absence. Laura and her children are able to help Hana and Cate face the future's uncertainties, while at the same time Hana and Cate discover that they are able to help Laura's girls grow up in numerous unseen ways.