Technically, you still can shower everyday.
However, most full time boondockers don’t.
Boondockers generally shower anywhere from 3-4 times a week, to just once a week. Some may even go longer. The reason why is because most boondockers want to remain camped in the same spot for as long they can. This saves them from the hassle of picking up camp, spending the fuel to move, just to refill the water tank. The longer they can make their fresh water last, the longer they can stay.
A lot of full time boondockers maintain memberships at nationwide gyms such as Planet Fitness or Anytime Fitness. This allows them to take showers at the gym instead of using their own fresh water tank.
Taking showers everyday is actually unhealthy. The body’s natural oils helps protect us from bacteria. Soap also dries the skin and causes it to crack, allowing bacteria to enter. Recent research shows that people who take fewer showers each week are actually healthier.
If you still need to shower as often as possible, then practice taking “Navy Showers”. This is where you dowse your body with water, then shut it off. Do all of your body washing and hair shampooing. Then, turn the water back on and rinse everything off at once. You can often limit your water usage down to two gallons. Some can even do it with just one gallon.
Many people who transition from life in urban areas to a life of boondocking often take months and years to fully adjust. It’s not uncommon for some to spend the money for a night at an RV park, just to help with the transition. Eventually, the need to shower as a recreation slowly fades away, and people tend to discover a new set of joys and perspectives on living.