@Heartlander. Thank you. I didn't realize there were two strengths (2 and 5 percent) and that one needed a prescription. I bought the 2 percent version of Lugol's on line. The other thing I did was buy the 3.5 percent concentrate of food grade hydrogen peroxide. I know it comes in a 35 percent solution (an entire gallon), but I thought the less concentrated solution would be easier to deal with in terms of dilution and ratios. I don't need an entire gallon of it as very little is needed for the nebulizer.