Dont know about best but I have a couple. A canvas bag type, gravity shower with a pretty big rose, lasts ages, heat some water on the fire, lower the canvas bucket, fill it up and raise it, works great, very efficient, or I have one of those bilge pump type ones that has a cigarette lighter adapter, drop the intake into a black container thats been in the sun all day, or if its a hot day, have a cool shower with it. Havnt used it for a while and its Chinese made from SCA, so will check it before next use....also got a wooden shower board to stand on so feet dont get dirty while showering.(Bunnings)