Don't bathe in creeks. Biodegradeable soap can still take a long time to degrade, and that stuff can really wreck a small stream or creek and others may be downstream using it for drinking water.So what are the pros and cons of bathing in a creek, lake, river , and etc compared to boiling the water and using that?
If bathing in creek soap would be used though. ( the backpacker kind)
Some of us would call what you are using a "solar shower". We would just pour that water into a bucket with holes in the bottom is all.You can end up smelling like creek water, depends if the water is flowing or is a bit stagnant.
I haven't used a solar shower but if you get a plastic jerrycan and fill it from the creek and then sit it in the sun all day at your camp, it will warm up.
The amoeba you speak of have to be taken into the nasal passages...keeping your head out of the water works fine...La does have them, also most any warm,slow moving water source...the La cases were from people using Nasal Irrigators w/o boiling the water or using bottled water..sure deathGood chance you will pick up some worms that like to dig around and eat your insides. Whether you would actually notice it or not is another thing. The body seems to survive worm infestations reasonably well all things considered. You could also do a de-worming occasionally by drinking some boiled down black walnut hulls for a couple weeks.
Some areas have some really nasty Amoeba in the water that goes through your sinuses and eats your brain. Those are not so good for you. Louisiana I think someone here said?
Brain-eating amoeba found in Louisiana water
Brain-eating amoeba found in another Louisiana water system - CBS News
That hangs out in the Colorado River, too.