There are two acceptable forms of bottled water. You may use bottled water that has been processed to remove Cryptosporidium, a type of bacteria known to cause gastrointestinal infection. There are three processes a manufacturer can use to do this including reverse osmosis, distillation, and one micron absolute filtration.
The other acceptable form is bottled water from a naturally protected source, such as a deep artesian well.
To confirm that specific bottled water has undergone one of the above processes, you may contact the International Bottled Water Association (IBWA) at 1-800-928-3711. If the IBWA does not have information on a specific brand, you may call the bottler directly. Ask if any of the above processes were used to assure the removal of Cryptosporidium.