With the recent advancement of the cloud, edge, and fog computing methodology data processing and buffering become more crucial tasks. This is even more critical for real-time applications like the Internet of Drone Things. The traditional edge-fog-cloud methodology highly relays on strong Internet connectivity. In case of a mission-critical situation like UAV-based surveillance, aerial reconnaissance mission, or disaster management the network connectivity becomes extremely intermittent. As a result of that, there is a high chance of packet loss. To avoid this situation, the Dew computing methodology can be considered. In this system, the state-of-the-art Dew-enabled nodes will be taken into account as a part of the Internet of Drone Things structure to ensure Dew as a service phenomenon. This chapter primarily investigates the different components of the methodology of Dew as a Service (DewaaS). Secondly, the impact of Dew as a service intermittently connected IoDT and the technical challenges. Finally, the possible use cases of DewaaS for mission-critical Drone applications.