Honestly probably not that serious. Even in their myths/stories, the oracle would tell great doom and then no one would listen. I expect they got inspiration for that from somewhere.

Coke (the soda) is 90% water.

Your soup will still be a soup (or a thin broth, at least) at a far higher percentage of water than you think it will.

If I had to guess, it’s mostly water.

The really scary stuff (in aqueous solutions, anyways) isn’t usually brightly colored, it’s usually clear. Of course there are exceptions - like bromine or iodine - but I know what those look like and nothing on that tree looks like either of those.

The reason for that is that most pigments are conjugated ring systems - complex organic molecules that break down in harsh environments - so anything sufficiently reactive would actually destroy any colorants you added to them.

I’m not saying that bright, friendly colors are always safe… but the easiest way to get a bunch of bright colors is to use food coloring and water.