We are in the process of building an outdoor bathroom for our property and we are completely off-grid. In the interim, we needed some sort of shower structure/bathroom area. We decided on the kitty litter method until we get a septic system installed just because it’s the easiest and we’re not able to use a composting toilet due to the freezing temperatures. Anyhow, hope this gives you ideas on what to do for maybe your campsite or while you are in the process of building your own off-grid cabin.