Our Portable Washer does the job, the drying is by hanging items to dry after spinning them. You can easily dry them in less then a day if hung outside, but if inside can take up to a day and a half. Took about 45 minutes to wash and spin and about 9 gallons of water.
The loads are not big. Here I did a heavy pair of shorts, one pair of compression socks, two pair of underwear, two T-shirts and a handkerchief. So for two folks it will take an hour and a half to do two days worth and about 18 gallons of water.
Here is the unit in our shower with the electric outlet around the corner on the desk. We fill it with the shower hose and let it drain down the shower drain.
Here you see the washer full and ready to go, we wash for about 15 minutes a load.
In the above photo washing is done and we are ready to start spinning. We insert the spinning basket, it only holds about a third of the wash so here is the time consumer about 3 minutes per spin load.
Here we are trying to dry out the washer and one wash load in the shower took a day and a half. So outside is better if allowed at your camping area. Coin are still a good option if you have one around because of load size and using a dryer. One washer and dryer load can cost a total of 3 to 5 dollars depending. But id you have a couple hours and the water the above washer works OK.