Turns out, bottom brackets, hubs, pedals - all serviceable. And, shops and the interwebs have bearings, grease...
It's a bike, not an oil painting. Ride it! Water-crossings are fun!
I've crossed creeks on road bikes, gravel bikes, mtn bikes... I have swum (it's swum, right mom?) across rivers pulling my mtn bike lashed to a flotation device... then road it for 60 miles... butter smooth.
Get'em wet!