It all started in south India, monhenjo Daro in 2600 B.C and 1900 B.C. And the river was the indus River.
The homes back then in the indus river civilization had access to the river and get water but also had drains for the waste.
The restrooms back then had access to drain the water out to the main streets.
They had special bath to relax and talk to frineds and enjoy the water drinking red wine. But only special people would usually be there like the king and his family.
Seals were used for trading goods with other countries. They would be made on ceramics or the clay tags used to seal the rope around bundles of goods.
Farmers brought food into the cities. City workers made such things as pots, beads and cotton cloth. Traders brought the materials workers needed, and took away finished goods to trade in other cities.