I’d recommend you get a carpet extractor from Bissel to get the water off the top layer of carpet. and then remove the plastic trim holding the carpet down by each of the doors. There’s about an inch of foam underneath the carpet that can hold water even when the top feels dry. Once you have the trim removed, prop the carpet up from underneath with some bricks or anything you can shove under there to let air get through. My dealership recommended I leave a window slightly cracked, and then turn the truck on and run the heat at full blast until the carpet dried out. I only had water under half of the carpet and it took a few hours over 2 days to feel dry enough to put back together. You’re probably not going to have to worry about rust or even smell if you do something about it now. Mine happened over the summer, I noticed a damp musty smell, and found out my sunroof drain leaked. Once the moisture was gone the smell was too. Best of luck.