Do the camping cottages have any appliances in them? Is there a bathhouse in the camping loops?

No.

Bathrooms, as ithers said. Appliances...usually 'deluxe' cottage has fridge & MAYBE micowave, at least one household outlet @ inside counter. 'Regular' cottages just have outlet, no appliances. Contact station usually open later than office, best to call & confirm this location typical as other Pa State Parks w/ cottages

I knowbthey have out house in the rustis campground s with water spickets no shower's but you can gi to the mainbpark for shiwers and its only a one nite thing

I honestly don't know about the cottages, but there are showers in the modern camping area, and cold ones at the beach.