Fresh water won't be too hard on the hub or chain. Note that rhe damage happens while things stay wet for hours after leaving the water.
So, marine grease, then use a heat gun or powerful hair dryer after each set of runs so the wet time is minimized.
You can also buy zinc powder, and blend it into the grease to add some extra time against corrosion.
FWIW, my road bike/touring bike has been submerged multiple times in floods and 1 lake. No damage or rust despite no special precautions or maintenance.
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Just out of curiosity ---- how long is the event?. I'm a diver and know what hard effort does to sir consumption.
Last edited by FBinNY; 01-17-23 at 07:05 AM.