I had an idea about beer bottles that would award caps like Nuka-Colas.

how would I go about making it that when ever you drink one, it adds one cap?
I looked for a mod like this but to no avail.

Would this be a simple script job?

Done
http://www.fallout3nexus.com/downloads/file.php?id=13761

I think that making a script would be the easiest way.

It's fairly easy. If you open the GECK and load Fallout3.esm, then go to the game effects part of the object window, then to ingestible. If you click on NukaCola there, you see it has a 'Nuka-Cola Add Cap Effect'. This adds the cap when you drink it. Double click on it. The effect's ID is NukaColaAddCap. If you add this same effect to beer (Don't forget the GetIsID player condition you also see on the nuka cola effect, so you don't get caps when other people drink their beer) then you'll also get a bottle cap when you drink the beer.

Thanks for the help. check out my Nexus page if you want the esp.