Battery problems of the 2008 Toyota Matrix

Several months ago I drove through a puddle of water in our parking lot at work. It was storming with the wind blowing as well. When I drove through the puddle, my battery light came on and I lost steering. Then engine never stopped. Once I traveled a few yards, the steering started working and the battery light went off. It happened another 3 more times before I ever left my work facility. I was able to drive to a Toyota dealership for them to check it out. They found nothing wrong with the car. I told them something makes me lose steering associated with water. The gentleman at Toyota told me not to drive through puddles. I did not think it was funny. It has happened a few more times with my husband driving. We live in louisiana and it rains. I can not avoid going through water when it rains. I need help.