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That's a very useful chart for me. I studied Comparative Religion as an optional subject in my graduation and found out that by origin most religion were specific to their place and time of birth.
Like the inception of one desert specific religion happened on such part of the Earth with water scarcity. So, the Messiah taught those pre religion tribes to preserve water and use it in ways to reuse wherever possible.
The Wudu is often translated as 'partial ablution', as opposed to ghusl 'full ablution' where the whole body is washed. It also contrasts with tayammum or "dry ablution", which uses sand or dust in place of water principally due to water scarcity or other harmful effects on the person. (Link)
In desert areas, there used to be a small tank in which almost everyone used to perform wudu of hands before going for prayer.
But as these people spread out, they did not leave those traditions which were necessary in the deserts due to some limitations. They even continued to follow wudu together in the same pot/pit beside the rivers.
This isn't the case with one specific religion, it's a similar story with almost every religion.