Leeks

But breathing is a prerequisite of living, so while you may not be able to walk every day you are alive (you become disabled or elderly) you will always breath. Over the course of a life, breathing is likely the better income.

Well there’s only 10 options, try them all! (For science)

“How to save a life” by The Fray is literally intervention instructions.

Sure. It just means you got a drinking buddy!

“Manna” from Marshall Brian. It’s a available online: https://marshallbrain.com/manna1

Did you just make a universal API?