Drink Up!
There are 8.36 x 10^24 water molecules in a glass (approximately 250ml) of water.
https://www.thenakedscientists.com/forum/index.php?topic=12443.0
The Hydrosphere contains 1,386,000,000 cubic kilometers of water, (or 5.544e+21 glasses)
https://water.usgs.gov/edu/earthhowmuch.html
This means that if you had a glass of water and dumped it out and it spread evenly (which it would largely do over time), each future glass would have, on average, over 1000 water molecules from that original glass.
Furthermore, an average person sweats between 800 to 1400 milliliters during an hour of exercise.
https://www.active.com/triathlon/articles/cracking-the-code-on-sweat-rates
Assuming the lower end of the range of sweat produced and reducing the "exercise" to ***just under the two-minute mark***, that means that one person produces about 25 milliliters (1/10 of a glass) of sweat during sex.
Statistically speaking there is about a 100% chance that every glass of water you drink has at least one molecule (on average over 100) from the sweat produced by Donald Trump when he had sex with Stormy Daniels.
Could someone check my math? Because if this is right it's a rather harsh reality.
= new reply since forum marked as read
Now I need to start drinking my own urine. 
not shitting you
