I grew up in Texas, so the connotation of a “spur” is not with refreshment, but more as a means of jabbing a horse to incite him to go. That certainly wouldn’t feel good going down.
I might also think of the San Antonio Spurs.
But certainly not a soda from the Canada Dry family. Sure, I’ve had plenty of tummy aches and plane rides that resulted in drinking Canada Dry, but I’ve never seen Spur cola. In fact, I’ve never seen Hi-spot either. Maybe these are only sold in places closer to Canada?
In any event, they sure have cool memorabilia. Ever drunk a Spur, my friends?