It Helps If You Don't Think About Where Its Been...
Its probably more of a psychological exercise than a
scientific one... after all, we've had the technology to filter and
purify water from a number of not-so-palatable sources for a great
number of years -- though it sure hasn't been used THIS way.
Still... it has to be one of those "how much did you want this job,
again?" moments as you take your first sip of recycled H2O...