There is a moral superiority that the Confederate Army enjoyed over the United States Army. They didn't have coffee-boilers who loafed about while their buddies were fighting. One Corn-fed explained:
Now as to coffee-boilers. They were so called in the United States Army because they remained in the rear and boiled coffee while the other soldiers were at the front. In the Confederate Army we called such men stragglers. We could not call them coffee-boilers, because after 1863 we did not have any coffee.
Mind you, this superiority did not translate into a combat advantage that gave the Confederate Army an edge over their Union counterpart. If nothing else, the Union army may have been healthier because boiled water (for coffee) was safer to drink than water that was scooped up from a pond, gutter, roadside.