Hiking and rustic cabins rock. A week straight of cold showers? Not so much. The simplest solution is this Zodi portable outdoor shower ($165). The stainless steel container can be sat atop the propane stove, heated to 100°F in six to ten minutes, and then pressurized with the hand pump. It comes with a thermometer (so you can get it just right), a six foot hose, and a carrying bag.