Examples:
Intro Saras: Oasis lake
Intro Kumid: Pool
Saras and Kumud: Buckets of water from well
Saras: Saves kid from water
Saras: Water on sandals after puja
Saras: Water play with Yash and Kumari
Kumud: Go in the water and get my kite
Saras: Almost drowned in water where mother died
Kumud: Throws water on Karas in the storage space
Saras: Goes around looking for cold water once in love, hidden agenda to find Kumud
Kumud: Gets away from dad with excuse of getting water
Those are just a few. I think their love symbolizes water because it is as strong as water which is both life when needed in thirst and death in natural disasters. Powerful and passionate, yet malleable - will pass through any crack, dark alley, any opening really.