I'm sorry for your bad experience. Sounds like you need a good carb cleaning, maybe even a rebuild. Also, why not drain the fuel completely and put in fresh stuff along with a new filter? If you think you have contaminated fuel don't run it through your engine. Get rid of it. Also, look at the numbers on your propeller (behind the nut) and post them up here. We may be able to help you with some of your issues.

Finally, do a search on "water under ski locker floor". A few models suffer from this and guys have drilled an access hole and installed a cover. You can use a shop vac to remove water. Keep your bilge dry and you can help this a lot. It's been a little tough so far but you have a decent boat. It may take a little TLC but try to enjoy it along the way.