What does it mean to describe a woman as good as water?

What it means here is that a woman's character and personality are like water.

If water is good, it comes from the eighth chapter of Laozi's Tao Te Ching: "If water is good, it will benefit all things without contention, and it is evil for all, so it is better than Tao." What I'm actually talking about here is the way to be a man, that is, to be a man should nourish everything like water, but never compete with everything. This kind of character is closest to Tao.

Water has a broad mind, can contain all things, and at the same time has the characteristics of softness and adaptability, which does not dispute and grab, and conforms to nature. Such a woman usually has noble character and kind heart, and can live in harmony with others while maintaining her independence.