What exactly is a data center by your definition? What individuals (that are entirely disconnected from corporations) need them? How many individuals have personal data centers of such a scale that they would need to produce liquid water on-site for their computing needs?
I genuinely believe you’ve described an entirely theoretical person that doesn’t reside in this universe.
Most modern buildings have at least few racks of compute/storage for services like TV/phone/internet, camera recordings, etc. Even family houses have small racks nowadays.
Ignoring this specific example, a majority of the population uses social media for leisure and online tools for work (email, banking, etc.).
A majority of interconnects between ISPs and networks are hosted in data centres too... so there wouldn't be much of an internet without them.
If you closed all data centres over night, the majority of the above would disappear and certainly would not be able to scale as large as it had without data centres... hence, a majority of people need data centres to maintain their current standard of living.
And considering how highly technical something like a modern water treatment plant can be, data centers are already a major force behind some of our potable water.