if you're urban.. baby wipes, smal, don't spill in your pack, and you can wash your ass nuts pits and face (the only things that matter) not necessarily in that order.
If you're in the woods... just get some sunshine and smoke on that funk and it'll be fine.
I had staph for 2 years, and I took a shower regularly... so the whole shower thing = no staph is Bullshit.
oh and on occasion I'll fill my spacebag with water, leave it in the sun and take a hot shower for the joy of hot water running on my body.