Reverse Osmosis (RO) water is usually very clean and safe to drink. Many bottled water brands use RO treated water.
no it cannot purify
Pay attention. Eye protection. Don't drink.
Reverse osmosis is a method of purifying water. If the semi-permeable membrane this method requires remains intact, it's a very effective way of filtering most pollutants from drinking water. You're safe against biologicals and most organic and non-organic toxins (although I'd probably exclude radioactives from the safe list).
It must be at least filtered and boiled
cows drink gas
from its mothers blowhole they stick on to the blowhole for safety to
spring water is usually (not always) safe to drink without being treated.
If by "cure" you mean make safe to drink, it can be boiled, or treated with a disinfecting chemical, such as chlorine. It can also be treated with ultraviolet light.
Whether or not you can drink lab water will depend on what has been added. If you are referring to the water from the safety areas, then yes, you may drink that water because it's distilled.
it's not processed, it is filtered and or treated. There are many different ways to filter water. And you can drink straight from spring water.
Forever unless you have treated the water to make it potable.