http://info.nsf.org/Certified/ ...
Published by Bob Foerster, Executive Director at Nevada Rural Water Association
http://info.nsf.org/Certified/PwsChemicals/Listings.asp?ChemicalName=Trichloroisocyanuric%20Acid&
The chemical is listed in NSF 60 for use in drinking water in the US; the above link shows the several certified manufacturing facilities. The ANSI/NSF certification process includes rigorous testing as well as production process monitoring. In the US, chemicals having the NSF 60 designation can be used in drinking water and materials having NSF 61 can be used for contact with drinking water.
There are purpose-made chemical feeders for the product. Please be aware that NaOCl has a fairly short shelf life and if on-site generation cannot be accomplished, a calcium hypochlorite or trichloroisocyanuric might be a more appropriate choice for a remote location. Disinfection using ozone or ultraviolet light are other choices, along with chlorine dioxide... nothing is perfect !