Selecting a suitable water treatment technology for home

What is an alternative to RO filter?

In Solapur, Maharashtra, water quality of tap supply is (with reference to BIS 10500):

Turbidity 0.32
pH 7.62
Chlorides 168.0
Nitrates 2.41
Total hardness 340
Alkalinity (as CaCO3) 322
TDS 714
Iron 0.06
Fluoride 0.46
Normally RO filters are being used but it is wasting lot of water, please suggest a suitable method that makes the water potable without wasting it. Thanks