You'd need to drop your fuel tank and drain it out.
YES !
no
You have a mess.
Mis fires, stalling, no start.
I doubt it. I think you have water in your tank because it's no way how antifreeze can go in your tank unless you puuted it there. So if you have water in your tank, just buy stuff which is called dry gas. And everytime when you fill your tank add required quantity. To get rid of water in your tank you will need to do that at least 3 times, it depends on how much of water you have.
Yes
Depending on what, you may have to remove the tank to clean it, you may have to replace the motor if it is run.
Have you tried using gas line antifreeze? That will help to remove some of the water in the gas. The best way to make certain all the water is out of the tank is to siphon the gas out, let the tank air out and re-fill the tank with gas from a station you know does not have water in the gas.
Um, no! There are addatives you can put in. Just goto your local parts store and they will assist you.
other than getting a bit of either water and or slug in your injectors it should be nothing should happen... get a carb/fuel injector cleaner in your gas tank fill up the tank with gas 89 octane or better and drive. I also put GAS antifreeze in at about half a tank and run it almost empty to clean my tank out before and after the winter which is when water can best get into your gas tank.
No, you find the fill nozzle on either side of vehicles.
If you accidentally put kerosene in your gas tank, you should siphon the tank to remove as much of it as possible. Add about half a tank of gasoline, then run the car as normal. The car may act up some, and if it has too much trouble, take it to a mechanic right away, but otherwise the kerosene should burn up and not cause any real problems.