Roman lamp question

[M. Demetrius]

Many AmerIndian tribes did exactly that, Iagoba, by puttin a glowing coal in a pile of dry wood dust or shavings, and wrapping it in tree bark. This can be converted to a fire whenever needed by simply blowing on it. Carrying two or three of these firestarters, one smoldering, the others waiting to be used can keep a fire ready to go for at least a day or so. At the next fire, just repeat the process.

Now if you fell in the river, you'd have to start all over, of course.