What is the definition of Necessary Fluid?

A 'necessary fluid' is like the secret sauce of life, but instead of being a ketchup on your sandwich, it's an internal, often-overlooked component that keeps our bodily functions humming like a well-oiled machine. It's the unsung hero, quietly doing its job until someone forgets to refill it.

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Now, here's an unsettling example sentence: "In the face of existential dread, the only necessary fluid left in my system was my own fear serum." Talk about a cocktail of existential anxiety and self-medication gone wrong!