No problem.

1. Grab cat by scruff of neck
2. Hold cat under shower head with water on, and your elbow held high so cat can't grab your arm.
3. Drop cat and let it tear out of bathroom like a shot.
4. You won't see cat for about two days and it will never forgive you anyway.

The reason cats hate water is because they look so goofy when they're wet. Cats HATE looking goofy. Dogs thrive on it. Get a dog if you want to bathe your pet. Just don't bathe WITH it.