Item 1 “I can fall from the sky, like a gift from above. I bring new life, a child of love. You discard me like nothing, like I have no worth. But that's a mistake in this quarter of Earth."

Item 2 "I fill you up, feel me inside. Go without and surely you will die. Fresh as the air, a sigh of relief. Make a wrong step, and your last will be brief"

Me can't answer that

For item 1 the answer is water
BUT I do not know the answer for item 2