so you find yourself in 272 bc....

[Aemilius Paulus]

Then over his lifetime he consumed 3.9065*10^26 molecules (from FM of water = 18g and avagadro's number)

That gives 287243 molecules per litre. Now multiply by average daily consumption (3 litres)

Gives 861729 molecules per day.

Yes, I know the mathematics too. So what? Too much hydrates in this world anyway. You large numbers may impress a random person, but anyone who sets aside more thought to this will see the folly. And no, I am sure as hell not going to prove my counter-point with a calculation to determine the quantity of molecules on Earth. The scientific notation will render it far too abstract to have a use in a practical, common argument anyway.