Planning to go on a semi-organized trip where river crossings are involved and was just wondering - if my precious was to fall over in the river and get completely submerged what should I do?

Being somewhat mechanically challenged here are the scenarios I thought of

- Water is sucked in under the seat. This should just wound up on top of the piston and get spit out, right? Meaning if I just keep it running it should lube back up by itself and be ok?
- Bike stops and water gets in through the exhaust. I could imagine this being the worst as the piston might not be at the bottom, meaning water would go straight into the engine thereby reducing lubrication and eventually maybe even rust?

If it were to happen perhaps the smartest thing to do would be an oil change once I get back?

I realize this must sound like the ramblings of a child to you guys, so please enlighten me