Check gauge's light turned on

I was driving home from work on the freeway all of sudden I had no power steering. The temperature gauge went all the way up voltage gauge all the way down. Oil pressure gauge at half way mark as it always is. The check gauge's light came on. I got home parked turn off the truck waited then I started it up light came back on the gauges went back to low voltage temperature all the way up. So turned off the truck opened the hood the water reservoir empty but I saw the serpentine belt was shredded. Could that be the reason why I am having this problem or is it this and something else? If you can tell me what is or might be please let me know. Thank you