Nature's Oil 100% Pure Propylene Glycol (USP Grade) 16 oz
Nearly odorless clear liquid with a  mild sweet taste.  Some other names for  it are a-propylene glycol, 1,2-propanediol, 1,2-dihydroxypropane, methyl ethyl glycol  (MEG), methylethylene glycol, PG, Sirlene, Dowfrost.