The word diluted means watered down, as the dark soda became lighter in color and looked more like iced tea, because the soda became "weaker" and/or "thinner" with the addition of water (or possibly another solvent).
The Preamble:
We the people of the United States of America, in order to form a more perfect union, establish justice, ensure domestic tranquility, provide for the common defense, promote the genreal welfare and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this constitution for the United States of America.
It states that they're going to provide freedom for the nation, provide support for our soldiers (I think that's what they mean by common defense), enforce laws, and basically make the nation just a peaceful, free land.
Let me know if this helps.
Volume should be the answer
This could be a metaphor or irony depending on the context
Irony can be a word or phrase that says one thing but can hold the exact opposite meaning or something close to opposite.
metaphors are words that hold deeper meaning or mean something else than the literal phrase
"half a loaf is better than none"
