I have a Katadyn Pocket Filter that will soon have a Sawyer SP 135 attached to the outlet, and that currently has a Katadyn Activated Carbon Cartridge attached to it. When finished I'll feel pretty secure that the water that has gone through all of it is about as safe to drink as water can be.

While I'm pumping I'm sure I'll hear "Powerhouse" by Raymond Scott... You know, that song you'd hear in old Warner Brothers cartoons when some assembly line machine was in action.