Portable, solar shower for camping Solar showers consist of a durable, plastic, black PVC bag that heats the water inside with the heat of the solar rays. It takes about 3 hours for the water to heat up and it can reach up to 50 degrees Celsius. Once the water reaches the desired temperature, there is a valve that allows the water to flow through the special tube. The bag comes with a hanging attachment and a handle for easy transportation.