I think you know what I mean.
trying to buy "one" days worth of supplies at a time only works for some things. For other items it's problematic or not cost effective to do so. This concept of stores or campgrounds catering to backpackers I'm not too familiar with. I have only toured in Western Canada and most camping services are geared towards motor vehicle traffic, spread pretty far apart and seasonal in nature. Before Victoria Day or after Labour Day you are more likely not to find convenience at every turn.