Why does water with similar properties tend to collect in an area?

Question

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Answer 1

Pure water has no other constituents. But it is a good solvent.

All water that collects in a given region extracts chemicals from that region and is in equilibrium with the environment.

This is what causes water in one region to acquire similar properties.

Answer 2

Water is attracted to itself, so water droplets collect to form puddles.

Answer 3

Water molecules have a slight polarisation (more positive at one point, more negative at another) caused by the imbalance in the structure (with 2 hydrogen atoms, 1 oxygen - it cannot be a uniform structure like H2 is). This tends to make water molecules attract to each other and align themselves according to this polarisation. This is also what causes surface tension - the slight "skin" on a drop of water or on a still body of water (e.g. a glass of water) that you can see indent very slightly if you press it before it breaks and allows an object to enter the body of water (or causes the droplet to run).