1989 Dodge Ram fuel tank

1989 Dodge Ram V8 Four Wheel Drive Automatic

I poked a big hole in my gas tank. It is a plastic one. I didnt take it off, I got a friend to do it who can no longer work on it, to take it off. How hard is it going to be to put one back on. Would it be cheaper to get a tank and put it in the bed of the truck. It is a hunting truck, so it doesnt have to be same as it was. Just need to get gas in it. Could I put a different type of gas tank? Any suggestions? Thank you