Water

It is a liquid!
You can drink it if it's clean
It has alot of purpose, such as

Cleaning, making certain foods, a home for aquatic creatures, and alot more i will not name

Person1 : Hey! Could you lend me some water?
Person2 : Sorry, I drank all of mine.
Person3 : I still have some water, I guess i could lend you some!
Person1 : Thank you!