If the fuel is contaminated, and certainly with water (which can mean extra O2 in the exhaust), all you can do is wait for a new fuel fill. REMEMBER: at the extreme temperatures in the combustion chamber, elements can separate and combine that won't do so at room temperature and pressure. In fact, that is the reason we have EGR systems and cats. Read about why you have an EGR system and you will get the idea. SO I'd relax and burn off that gas and see how things go next time.

Running 89 octane is like running 20W50 conventional motor oil or paper oil filters, do whatever you want to, it's your car.