Bib Berkey is the only way to go! Anything I drink or cook with goes through it first. I have the additional filters for arsenic and fluoride, but am saving them for if/when I actually need to purify standing or ditch water.Big Berkey - that's what I was thinking about on Frugals..
I've got a life straw as well - that's part of my portable kit.
I drink tap water and always have. I'm mostly concerned about getting dysentery in a bad situation.