FIG. 1 is a front-top perspective view of a housing for a water vapor distillation apparatus showing the claimed design; FIG. 2 is a back-top perspective view thereof; FIG. 3 is a right side view thereof; FIG. 4 is a front view thereof FIG. 5 is a left side view thereof; FIG. 6 is a back view thereof; FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof.