Crush some grated ginger,curry leaves,greenchillies coriander leaves & set aside.

Mix curds and water and churn in a mixer with little salt and hing.

Add the curds water mixture to the crushed masala.

Add salt and water as per your requirement

Filter the mixture smooth. This will be white.

Alternatively you may grind the masala and add to buttermilk.But this gives a greenish colour to the neer more.