I'm not coffeecup, but I'm using DMSO. Don't know how "pure" it is, but it is veterinary quality and if it's good enough for a dog or cat, it's good enough for me. I got mine at Petco, on-line, but suspect you can get it at the retail shop too. I remember many years ago when friends of one of my relatives were applying it topically and drinking it - straight out of the paper mill process that produces it. I think that any directions for a "pharmaceutical" grade DMSO is an attempt to get a better price and that it is no different than the original. Just my own personal opinion.
I'm up to about 20 drops of DMSO with 10 drops of MMS 2 times a day. Been at this level now for a couple of days. I mix my MMS and ACV, then add water, then the DMSO and stir with a stainless spoon. There isn't a kick like drinking DMSO alone, but I can obviously feel it on my tongue and I'm of the opinion that it's an appetite suppressant. Will report more after another few days of using it.