Ipod 5 cracked glass and digitizer?

So I had my keys in my pocket with my iPod when the screen cracked when I layed down on the driveway with my friends. When I took my iPod out of my pocket it was cracked. Mainly at the bottom next to the home but there are a few other long strands going across the iPod but when I press down a bit hard on the screen it keeps changing colors. Will this be fixed my just replacing the glass or do I need a new digitizer and glass? I really hope the problem is just the glass but I am not sure. The color changing with pressure or "water screen" as some people call it, stated right after I got the crack any repair men who can help me or people who REALLY know what they are doing?