Early man is considered to be a Savage by today’s standards. Early man lived among beasts was naked and did not have shelter. He slept a lot and thought very little. Early man was toughened by exposure to the elements, so his body was strong and when he learned to recognize which beasts he could defeat he was no longer afraid of them. Early man developed the ability to reason and he realized that food, water, sex and sleep are good things and that pain, hunger and thirst were undesirable. People began searching for fulfillment and satisfaction, because their brains told them what their bodies needed to be happy.
People begin to relate events to each another by imitative sounds, gestures, and grimaces. As human ideas increased, gestures became more important and language expanded. If a person wished to warn others that a wild beast was approaching, they might give a low growl, or point in a certain direction, or imitate the beast by crawling or sliding their belly on the ground. Before language developed, humans were able to make a range of sounds and tones, and as the human brain evolved, we became able to form hundreds of thousands of words to produce language and syntax. There is no other natural communication system that is like human language.
It is thought that earlier hominids could have had a sort of language that used a more restricted range of consonants and vowels, and the changes in the vocal tract may only have had the effect of making speech faster and more expressive. Some researchers even propose that language began as sign language, then (gradually or suddenly) switched to the vocal modality, leaving modern gesture as a residue. Many experts feel that humans copied the melodic part of our language from birds, and that we evolved the content-carrying part of our speech from primates. These two types of communication fused together into roughly the form of human language that we know today. In time early man developed language skills beyond grunting and pointing. The ability to communicate complex thoughts was important for survival, and so language acquisition abilities evolved. The first words used had wider meanings and there were no abstract, general words, because general ideas are possible only with words.
The first talking humans obtained pleasure from being able to have someone understand their grunts and gestures, this social interaction led them to try and communicate their ideas more often to one another and this eventually led early man to invent conversation. In order for early man to imitate water, they would pretend to drink out of their hands or use body language to indicate swallowing and consumption, or smack their lips or make bubbles with their mouths. I think that the word water must have been one of the first words invented by early man.