It is ironic that in a planet formed by 70% of water there is the risk of dying due to lack of that liquid. I think everyone already knows that all living organisms on the planet need water to live.
What do you have to know?
If it is true that the planet is composed of 70% water, but only 3% of that water is suitable for human consumption, the rest is based on iceberg and other areas that contain frozen water such as Antarctic and other places where the temperature freezes the rivers of water.
Consequences.
In a world without water, first they would begin to arise new diseases because of dehydration and the first brutes of insurance would arise first in animals then the pathologies would be found in humans.
People would drink contaminated water due to the need which is not good at all and would only help to contract bacteria and viruses, it would begin to restrict more the use of water, to such an extent that enormous amounts will have to be paid for it, which will be almost unpayable for a common person, in that scenario alone the people with great wealth would be saved.
It would accelerate the process of deterioration of the planet turning it into an inhospitable desert, where in the maximum of 10 years there would be no type of living being on it.
I am here because of this.