Use a small, camping butane gas stove with cartridges as a backup if you have the space.
They are easy to set up, start. It will double as a way for making a hot drink on a long drive or picnic.
They are also inexpensive (~$25 AUD), and can sit around till needed. They are also safe.
Safety note:
- I would put this on the unused side of the stove top, as it will be cool.
- I would not put it anywhere on the stove that is still hot.