Bummer, the problem is not short term but long term. There is no reason why you can't get it running again. As mention you need to drain and change all fluids and remove the seats and carpeting. In the long term corrosion may cause you some problems.
You need to remove every connector and dry them out. Access the ECM and dry this out as well. Remove the spark plugs and crank by hand to see if any water comes out.