Thanks for the information. I do use a little Iodine, (one or two drops of 2% tincture of I in a quart) but we happen to mostly be where the water does not need disinfecting (we can see it melting off the glaciers or snowfields). I wouldn't be so confident, but my climbing buddies have been drinking untreated water for many many years without a problem other than the dementia which they had all along from the beginning. What the heck is C3H7OH? Did you per chance mean C2H5OH: Now that is something I can agree with, especially the type imported from Scotland.

P.S.
Hold on. I looked it up in a couple of reference books I have. Cyclopenten-1-olate. Hmm. " Narcotic in high Concentrations" says The Condensed Chemical Dictonary, 10th ed by Gessner G Hawley