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I second what Tug said, figuring out some way to get fresh air, free of water, is a high priority. Along with trying to water proof most things electrical, especially high voltage items. A good set of plug wires, and a water proofed distributor are just about a must.
Getting stuck isn´t nearly as embarrasing, as having your motor crap out in the middle of a puddle.
Can´t waterproof everything, but do what you can. A good long pair of jumper cables, a can of WD 40, a can of Quick start and a good tow strap. And an extra starter if your driving an automatic.
People forget water wieghs 7 lbs. to the gallon and mud is heavier. Shifting into a lower gear before you start pushing all that wieght, is helpful, then you don´t have to loose momentum (and RPM´s) downshifting.
If you do get water in the air cleaner, don´t even try to start it without pulling the plugs and checking if any water got in the cylinders. Water in the cylinders can terminally damage a motor quick.[addsig]