Is a lighter my only option of heating?

No.

Any sufficiently hot heat source will do the trick, just might take longer for you to get the click.

Also, some heat sources - like candles - might make your cap dirty with soot.

Some of the most common heat sources used are:
 * Lighter
 * Candle
 * Stove top
 * Induction Heater (there are some 3rd party heaters around. In the near future Dynavap will release their own IH)

For more information visit the Heating section.