i use organic cotton. i used to go to my favorite shop and get their branded organic cotton but i've since grown tired of buying an 1/8 ounce bag for the price of a bag full at CVS like some have said. Never boil the balls; i boiled my bags from the vape shop a few times, i didn't see a difference and didn't like the time i spent boiling cotton.
I have a friend who owns a juice line and he swears by cotton bacon, I have yet to try it but he tells me it's a must, he says no boiling and it tastes great. I think you can grab a big bag of it on Ebay or Amazon for cheap. Anyone here try it? I'll pull the trigger if it's something i'm truly missing out on.... I'll stick to the organic balls of cotton if not!