The old style canvas/rubber Lilos are a great way of floating a bike across a deep river, a pair of them tied together and lashed to the bike enable you to walk them across in anything upto to chest deep water - ideally use a guide rope as well. Keeping dry in those circumstances is irrelevant.
In fast flowing water you can use a rope tied to the opposite bank and then onto the bike and float the bike across using the power of the river rather than pushing/fighting your way across.
Prep the bike in case - plug the exhaust, pull the air filter and plug the inlet. Flood proof the electrics before you leave - spray silicone on and build up layers over a few weeks.
Clothing - if you know you will be riding in wet and cold conditions the majority of the time use a surfers wetsuit/steamer as your underwear - will keep you warm and a bit wrinkly if it gets wet inside but they can be lifesavers in low temperatures. Need to be dried out daily, downside is that they can smell.
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