Outdoor Shower Tent
If you are adventurous enough to be out in the wild spending the night, then maybe you can handle jumping in a cold creek for getting clean. The snow melt will invigorate your body, at the very least. Heating up water over the camp fire and doing a sponge bath might be okay for a weekend.
If you plan to be living outdoors for a week long camp out, you might find yourself needing a hot shower. Privacy tents are tall, skinny rooms, perfect for chemical toilets, showers or to be used as a clothes changing room. Some folks like to secure another larger tarp w/ rope, around a ring of trees to designate the official bathroom area.