Touring is partly about expanding your comfort range. The world won't end if you don't bathe daily or smell a little. There's a billion dollar perfume industry that's exists mostly due to the reality that people often stink.
Avoid bathing in rivers/lakes - detergent is bad for aquatic life.
There are quite a few solar showers devices which are nothing more than black water bags with cord. These, or a water bladder made by MSR or Ortlieb will provide a neat, lightweight shower capability along with the obvious necessary water carrying capacity. Don't ruin the material with boiling-hot water. This water bag is nearly perfect with the accessory shower nozzle:
http://www.modernbike.com/itemgroup....FQsGnQodmmEAXQ