Yes, there are several brands available.  I have only used PotableAqua,
which as an iodine product, should not be used for a long period of time
due to possible organ damage.  I've used it for a two week long back
packing trip, and all my organs seem to be intact.

Here are a few references worth looking at.  Bleach seems to me to be more
practical compared to the Aqua Tabs (which I have never used).  Aqua Tabs
are available from Amazon and some outdoor type stores.

http://www.cdc.gov/healthywater/drinking/travel/emergency_disinfection.html

http://www.cdc.gov/healthywater/emergency/drinking/making-water-safe.html

http://www.doh.wa.gov/portals/1/Documents/pubs/331-115.pdf

http://www.amazon.com/Potable-Aqua-Water-Treatment-Tablets/dp/B001949TKS

http://www.aquatabs.com/aquatabs-water-treatment-tablets/what-are-aquatabs-water-disinfection-tablets.html

http://www.amazon.com/s/?ie=UTF8&keywords=aquatab&tag=googhydr-20&index=aps&hvadid=94424935946&hvpos=1t1&hvexid=&hvnetw=s&hvrand=5756020579815282472&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_8p979nqm4b_b_p9

http://shop.elua.com/collections/aquatabs

http://www.aquatabs.com/aquatabs_products_range/aquatabs_usa_pack.html

If you really want the full story, you might want to read the following
long report from USAID

http://pdf.usaid.gov/pdf_docs/Pnads134.pdf

On Sun, May 29, 2016 at 9:40 AM, Jeff Palmer <jpalmer@mymts.net> wrote:

> Are there tablets you could add to the tank from a camping supply store?
>
> I'm pretty sure all the warning signs in Ontario showed up after a problem
> with one municipal supply rather than a problem at campgrounds. Sorry to
> hear of your sickness!
>
> Jeff
>
> Sent from my iPhone
>
> > On May 29, 2016, at 10:28 AM, Dennis Jowell <dennisjowell@GMAIL.COM>
> wrote:
> >
> > Thanks, Dennis and Eric for your response
> > In my hast to get off the farm I forgot these procedures.
> > I thought I cleaned the system in the fall but forgot to make a note
> about it.
> > Last couple of years as we traveled we started using bottled water once
> our onboard well water from our farm was gone. That worked great. Another
> learning experience.
> >
> > Dennis J
> >
> > Dennis Jowell
> > Scotch Hollow Farm
> > Newbury, Vermont
> >
> >
> >> On May 29, 2016, at 10:08 AM, Dennis Haynes <d23haynes57@HOTMAIL.COM>
> wrote:
> >>
> >> One of the problems with water while traveling is the supply. Many
> >> campgrounds/roadside water sources use untreated well water. Once
> something
> >> gets inside that tank and the tank gets warmed from being in the
> vehicle it
> >> becomes an awesome breeding ground for anything nasty that wants to
> grow.
> >> Bleach and tank cleaning treatments will help to clean but that only
> helps
> >> once. Also we have found over the years that even local water can cause
> us
> >> to become sick. When we go out to eat my wife only gets bottled water
> and no
> >> ice. Soda and coffee, tea, etc from restaurants all use local water.
> >>
> >> For drinking water on the road we use bottled. In our RV we have a
> filter
> >> that removes most anything that we use for the icemaker and the side
> tap at
> >> the kitchen sink. Still the tank water is used mostly for cooking
> cleaning,
> >> brushing teeth etc.
> >>
> >> Dennis
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
> Behalf Of
> >> Dennis Jowell
> >> Sent: Sunday, May 29, 2016 8:18 AM
> >> To: vanagon@GERRY.VANAGON.COM
> >> Subject: Onboard water supply?
> >>
> >> . What is a correct procedure to clean the onboard water supply to the
> sink
> >> faucet which I use as drinking water also. I came down with something
> as we
> >> traveled through Ontario camping. I think I did this wrong. In fact I
> may
> >> not have done anything with the water only filling it up trying to get
> out
> >> of town, ugh!
> >> Had to cut our planned trip short.
> >> Is there a water filter that's recommended to use while using a camp
> ground
> >> water supply?
> >> Dennis J
> >>
> >> Dennis Jowell
> >> Scotch Hollow Farm
> >> Newbury, Vermont
>