Copper definitely isn't going hurt you. I'm not sure what its like where you guys live, but here, everyone's water pipes are copper. I know the Romans used to use lead pipes, and that obviously wasn't a great idea, but we've gained a slightly better chemical/toxicity knowledge since then, and we wouldn't be using it in the pipes if it was harmful.
If you still want to filter, Berkey is definitely the way to go. If you want to kill any biological organisms, just boil it. It's not like you need to boil it for ages, 30 seconds is more than enough, once water boils, unless you suddenly increase the barometric pressure its not getting any hotter, no matter how long you boil it for.