Water is vital for all living things.

essential to the existence, continuance, or well-being of something; necessary.
Sleep is vital for good health.
This information is vital to our plan.
A vital organ needs protection.
vital importance
vital role
vital signs
essential
crucial
necessary
The doctor said that breathing is vital for survival.

of or relating to life; having life.
Water is vital for all living things.
Sleep is vital for good health.
This information is vital to our plan.
vital signs
vital importance
vital role
essential
crucial
necessary
Water is a vital for all living things.

something essential to the existence, success, or well-being of something else
Oxygen is a vital for breathing.
Sleep is a vital for health.
This information is a vital for the project.
a vital component
a vital organ
a vital role
necessity
requirement
prerequisite