In my rucksac, enclosed in a dry-bag, is an emergency kit containing numerous means of making fire; a magnesium fire-rod; 2 mechanical disposable lighters; a Maglite and wire; a tin containing tinder-fungus, birch bark, cotton wool/vaseline, bog-cotton, a gel-capsule of lighter fuel, rubber inner-tube, steel wool, a firelighter wrapped in foil and a couple of T-lights: Also in my rucksac are a number of disposable mechanical lighters which are out of fuel but still spark. I carry either a gas or petrol stove with a litre or 2 of petrol.
In my head, I carry the ability to use a bow and drill and the knowledge of how and where to find things that will burn - pine candles, pine resin, bog pine, bog-cotton, etc, where to find dry fuel and the knowledge of how to dry out wet fuel and keep a fire going in any weather. But my main asset is in having confidence in that knowledge. I do practice the use of my various means of firemaking at my leisure, often when the fire is already going. There's little point in practicing only on pleasant sunny days, however. Foul weather is a must!
I am no purist! I've been cold, wet and miserable and had my teeth rattling around in my head too often for that kind of luxury. When it comes to lighting fires in difficult conditions, my philosophy is Pragmatism. I use a lighter and whatever resources come to hand... failing that, there's always the Benghazi Burner!
Someone, I'm sure, mentioned what I think is an electronic lighter. Avoid them like the plague, as in wet or even damp weather you've got as much chance of a spark by banging your head off a rock!
Cheers!