Just purchased a 15000 btu 110 Frigidaire window

Just purchased a 15000 btu 110 Frigidaire window unit and we love it. However, since the rear of the AC is actually on the back porch, the water from the AC runs down the wall and on to the floor. We could not find in the manual anything about a place to attach a drain tube nor did we see evidence of one on the unit itself. Our house is wooden and susceptible to termites. How do we funnel the water from the AC to the ground? Is there a separate attachment for the AC? How do we funnel the water from the AC to the ground?
Thanks,oliver f. mckinney