Coca-Cola doesn't require a cold supply chain. The bulk of its weight/volume (water) can also be combined with a much lighter and smaller syrup or equivalent to be produced in a near-local fashion. It also has the benefit of scale.

Consider a rarely needed but life-saving antivenom that is expensive to produce, requires careful+chilled storage and is just not that abundant outright due to difficult production. A snake bite could happen anywhere, but its infeasible and potentially wasteful to have it stocked at every local facility. If a drone could be used to deploy it from a central facility to where its needed in a timely manner on-demand, that could save lives. In the developed world, roads make ground transportation a more suitable approach for this problem (in addition to everything else that makes the problem itself less frequent), but in many parts of the world the ground infrastructure is simply not there.