Dont do it man.
I made the same mistake on my first diy order, white label bottle??? It has un unpleasant taste, but humco PG is worse and that was USP grade...
edit:
A) I only used the Humco to downgrade a
juice from 24mg to 12, it then had a spicy taste(?)
B) On my first DIY I had a VG Base at 36mg, I used the white label bottle of now as my VG filler, it didn't work out so I ended up making a bunch of (delicious) 28-30mg ejuice. Alcohol or distilled water was added to test. I could definitely taste the NOW brand VG, it wasn't ... bad ... just not clean. The humco ruined some awesome Fuzion Vapor
juice.