The common ration of flour and water is based on 2:1 (flour VS water). But 2:1 dough need forcefully kneading which is quite hard to conduct for housewife. So I recommend adding around 5ml more for each cup of flour. For example 1 cup all purpose flour is around 120g, then we need to use 60ml water (equals to 60g). Then we add extra 5ml. So using water from 65m will be the perfect ratio. It will be good to start with a kitchen scale for the first couple of times. So you can feel the accurate texture of a good dumpling wrapper dough.