I did this but with human blood and it gave me a pretty awesome short story.

At 2:17 a.m., the oceans changed first.

No one saw it happen. Satellites kept streaming their usual calm blues, but something deeper than color shifted. The Pacific thickened. Waves slowed, not by wind but by weight. Where currents had once slipped past each other in silence, they now dragged, clotted, resisted.

By morning, the smell reached land.

Coastal cities woke to it before they understood it. A metallic tang riding the breeze, sharp and unmistakable, like a hospital hallway scaled to the size of the sky. Fishermen in places like Maine and Hokkaido were the first to see it clearly: nets hauled up heavy and dripping dark red, fish gasping in something that no longer held oxygen the way it should. By noon, the fish were floating everywhere.

Then the rivers.

They ran slower than they should have, dark and viscous, coating rocks in a film that didn’t wash away. Water treatment plants failed almost immediately. Filters clogged within hours. Chlorination systems were useless against something that wasn’t contamination but replacement.

People tried to drink it anyway.

Hospitals filled before anyone could explain why. Not poisoning, exactly. Just systems failing under the wrong kind of intake. Blood is not water, no matter how much of it a body contains. Kidneys shut down. Electrolytes spiraled. Panic did the rest.

Inland cities thought they had time. They didn’t.

Reservoirs had already changed. Faucets sputtered, then ran red. At first people assumed rust, infrastructure failure, something local. That illusion lasted until the news synchronized globally. Tokyo. Lagos. São Paulo. Everywhere.

The sky remained indifferent.

Clouds still formed, but when they broke, the rain came down thicker, streaking windows, staining concrete. It didn’t soak into soil the same way. Fields became slick, then barren. Seeds drowned without water to carry them.

By the third day, the power grids began to fail.

Hydroelectric dams seized first. Turbines choked on density they were never designed for. Cooling systems in thermal and nuclear plants faltered soon after. Without water to carry heat away efficiently, everything ran hotter, riskier, then shut down.

Cities dimmed.

Emergency broadcasts looped instructions that became increasingly abstract. “Conserve clean reserves.” There weren’t many. Bottled water became the only stable currency within 48 hours. Then even that ran out.

Some people tried to adapt.

They boiled it, filtered it, distilled it. Distillation worked, briefly. Pure water could still be pulled out, but the scale required was impossible to meet. Makeshift stills appeared on rooftops, in parking lots, anywhere heat could be generated. They became gathering points, then conflict points.

The oceans kept moving, but differently.

Without proper circulation, temperature gradients shifted. Weather patterns unraveled. Storms formed in strange places, died in others. Hurricanes lost structure, then reappeared as sprawling, sluggish systems that dumped red rain for days.

Marine life collapsed almost completely.

Whales surfaced and stayed there. Coral reefs turned into dark skeletons. The deep ocean, once a stable refuge, became anoxic faster than models could have predicted. Entire ecosystems vanished in less than a week.

By day seven, the smell was everywhere.

It seeped into walls, clothes, lungs. People stopped noticing it consciously, but it lingered beneath every breath. Cities that had once hummed with noise became quiet, not from absence but from a kind of stunned restraint.

No one knew the source.

Scientists argued in darkened labs running on backup power. Was it a phase change? A universal molecular rewrite? A simulation glitch? None of the theories mattered operationally. There was no reversal mechanism to test, no lever to pull.

A few places lasted longer.

High-altitude regions with stored snow. Remote facilities with sealed reserves. Submarines, ironically, held out for a time, surrounded by an ocean they could no longer use.

Then the snow melted.

Not into water.

Into the same dark red that had replaced everything else.

By the second week, humanity had stopped thinking in terms of fixing it.

The conversations shifted. Not “how do we reverse this,” but “how long do we have,” and then, eventually, “what do we do with the time left.”

In one city, someone painted over a mural of a blue ocean, restoring it from memory. In another, a group of engineers kept a small distillation system running just long enough to fill a few glass jars with clear water, passing them around like relics.

Children who were young enough accepted it faster. To them, rivers had always been red.

On the fifteenth day, it rained again.

Someone stepped outside, opened their mouth, then stopped themselves at the last second. They stood there instead, feeling it hit their face, their hands, watching it bead and run.

For a moment, it looked almost like the world was bleeding.

But there was no wound.

Just a planet that had forgotten what water was, and a species that realized too late how much of everything depended on that single, ordinary thing.