Apparatus and associated methods relate to a unitary cabin body having a utility compartment and a laterally adjacent personal compartment, the utility compartment forming a water reservoir in controlled, gravity-fed fluid communication with a climate control compartment, and a laterally directed outlet providing fluid communication from the climate control compartment to the personal compartment. In an illustrative example, the climate control compartment may be integrally formed to provide an evaporative cooling compartment and a plenum compartment. A float valve may regulate fluid communication from the water reservoir to the evaporative cooling compartment, for example. In various embodiments, a unitary roof body may engage the unitary cabin body in a stowed mode for transport, for example, and be raised above the unitary body in a deployed mode for occupancy.