My alternator has failed to charge my battery after having to drive through heavy flood waters. This alternator is less than a year old. What can I do?

What is your question?

This problem happened earlier last year (2019) and I had to replace the entire battery and alternator deal. I really do not want to be charged for another one. After the flash flood we experienced 20 degree weather; has water gotten into my alternator or engine and shorted something? There is a high pitched sqeak that is quiet when I start my car, and my battery is completely dead.

How long has your 2003 Mazda 6 had this problem?

a few days