Although not as refined as the method shown above I used to vape with a quartz glass cigarette bat that I used for combustion before I got my first vape. I would carefully heat the end of the bat with a lighter without letting the flame wrap around the end and ignite the herb. I achieved a decent roast with this method.
Or if you have complete disregard for your personal health or simply want to look like a meth addict you can go with the not-so-good old fashioned light bulb vape
My advice: I would either travel with a throw away vape, not partake, or *gasp* smoke