Safari/bucket showers are common in mobile or tented camps where there is no permanent plumbing. They are an effective yet environmentally friendly way to shower where water is at a premium and provide plenty of hot water to wash comfortably.
Generally, there is an en-suite private shower stall within your tent with a “rainfall” style shower head at which you can control the water flow. Outside the tent, there is a large waterproof bag or bucket which is filled with about 10 to 15 litres (5 US gallons) of hot water before being raised with a pully/rope system to either connect to the shower pipe or fill a cistern.
The water is delivered at the ideal temperature so it is best to use it as soon as it arrives. Staff typically fill the showers at a pre-arranged time of day, or you simply need to give them a few minutes notice so they can get it ready.