The formula for water (H2O) wasn't "made" by a single person. It's the result of a gradual understanding of the composition of water through scientific experimentation and observation over centuries.

Here's a simplified timeline:

* Ancient philosophers: Ancient Greek philosophers like Empedocles and Aristotle believed water was one of the four fundamental elements (along with fire, air, and earth).

* 18th century: Scientists like Henry Cavendish and Joseph Priestley discovered that water could be produced by burning hydrogen in air.

* 1783: Antoine Lavoisier performed experiments showing that water is formed by the combination of hydrogen and oxygen, and he accurately determined the proportions of each element.

* 19th century: John Dalton's atomic theory provided a framework for understanding the structure of molecules, and chemists like Amedeo Avogadro established the concept of molecules as composed of atoms.

Therefore, while no single person "made" the formula H2O, the credit goes to a collective effort of scientists who contributed to our understanding of the composition of water.