The water is a limited vital natural resource for the humankind.Fresh water is a scarce natural resource which is also very essential for our existence.
Nowadays, throughout the world we face on scanty of clear fresh water based on chaotic utilization.
.... you need to present this idea with more clarity. Try to re-phrase it.
After the hook (your first sentence) you should quickly introduce your prompt. It is about letting people use fresh water free or having the government to control its usage. Once you introduce this prompt, state your opinion clearly.