Definitely a good rule of thumb is to keep extra juice in stock. I have some that are sitting in a dark corner because they had a medicine kind of taste to it, but in cases like your current one, those would do the trick of at least vaping something, even if they had a weird taste.
DIYers would probably tell you to go get some VG and flavors from Wal-Mart or something similar, so you could make your own juice. That's about as close to clandestine as I would recommend for using a pv. Anything more, like say cleaning supplies, would probably get you raided by DEA task force or something to that nature. Haha.