Today, with a few exceptions of isolated water, Grok estimates that every single liter of water includes about 1.4 billion water molecules that were once consumed in some fashion by Cyrus. The same would be true for virtually every single other person who lived long enough go - got the number roughly in half based on age, I imagine, with someone only having lived to 35 being at about 700 million molecules per liter. There are, of course, many other variables, but this is the idea...
Because a single drop of water consists of over 1.6 sextillion water molecules, and the Pacific Ocean is only something like 2.7 quintillion liters (an entire order of power lower than the total molecules in a single drop of water), and due to the principles of molecular diffusion... This is all not just possible, but the only reality. That we are living in one another's blood, sweat, and tears, wherever we go.
Check out the question on Grok for some more details.
Think of this also in the sense of Holy Water - a blessing of water is meant to return it to its original state, meaning that water itself can be tainted to some degree through the ways which it interacts with us and the world... Think of how we imbue water with something whenever we are interacting with it, and what that means.
This holds up in our religious context.
