I know the WATER threads are too many, but..

EPA rethinks plastic bottle component's safety aspects

Nonetheless, health officials suggested a number of things people could do to limit their exposure to BPA, like throwing away scratched or worn bottles or cups made with BPA (it can leak from the scratches), not putting very hot liquids into cups or bottles with BPA and checking the labels on containers to make sure they are microwave safe. The drug agency also recommended that mothers breastfeed their infants for at least 12 months; liquid formula contains traces of BPA.

BPA has been used since the 1960s to make hard plastic bottles, sippy cups for toddlers and the linings of food and beverage cans, including the cans used to hold infant formula and soda. Until recently it was used in baby bottles, but major manufacturers are now making bottles without it. Plastic items containing BPA are generally marked with the number 7 on the bottom for recycling purposes.

http://www.cleveland.com/nation/index.ssf/2010/01/epa_rethinks_plastic_bottle_co.html

Biocidal silver

I'm thinking colloidal silver might be worth looking into, being that NASA has been using it in space craft for years....

In the 1960s, NASA’s Manned Space Center (now known
as Johnson Space Center) and the Garrett Corporation,
Air Research Division, conducted a research program to
develop a small, lightweight water purifier for the Apollo
spacecraft that would require minimal power and would
not need to be monitored around-the-clock by astronauts
in orbit. The 9-ounce purifier, slightly larger than
a cigarette pack and completely chlorine-free, dispensed
silver ions into the spacecraft’s water supply to successfully
kill off bacteria. A NASA Technical Brief released around
the time of the research reported that the silver ions did not
“impart an unpleasant taste to the water.”

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20050031218_2005019673.pdf