Water
It's always good to remind ourselves of what we need to live and that we have an untouchable right to it:
“ Water (H2O, HOH) is the most abundant molecule on Earth, composing 70-75% of the Earth's surface as liquid and solid state in addition to being found in the atmosphere as a vapor. It is in dynamic equilibrium between the liquid and vapor states at standard temperature and pressure. At room temperature, it is a nearly colorless, tasteless, and an odorless liquid.”