Hi Brian,
Most grocery stores now have "fill-it-yourself" RO water dispensers. There are 2 in this small town, and I've seen them at IGA and other supermarkets in Portage...
Unfortunately, they are not DI, but the water is a heck of alot more pure, than treated town water (at least here in the Whitemud Watershed area)
It's a bit of a PITA to carry 5g jugs around all the time, but I'll get my RO/DI set up one of these years....
The small tap water purifier sounds interesting tho' ....
~Tamara