Make sure the refill station didn't say that they remineralize it. I've seen ones that do RO and then they run it through a remineralizer to put minerals back in after "cleaning" the water through RO
The grocery store by me, Save-on (Western Canada only, sorry) has 0 ppm
The Sobeys had between 7ppm - 14ppm
I've never seen a water jug refill station at Canadian Tire though!?
The gas station I go to has a car wash attached but they also sell water because they have the RO system already, but a couple times it had a weird smell like they ran chemicals through it and it didn't rinse out properly.