ALL LB
Trying to answer how water is delivered to our homes; "One way water is supplied to town residents is for the water department pump water from a reservoir, river, or well into a water tower, which often sits on high points in the town."
Obviously, to poison a water supply at its source would not be very successful; poisoning water at it's delivery point would be way too forensically recoverable and suspicious if every single resident in a single community got sick at the exact same time, with the exact same symptoms…ect.
I think if a plan such as this were to be operable, the site would be the water department who gets and supplies the water. That is where the other chemicals are inserted to make the water "consumable", so why not a dose of spike proteins?
https://www.usgs.gov/special-topics/water-science-school/science/water-qa-how-water-supplied-our-homes