I agree with all except this one, “you should carry a water filter instead.” That water filter does NOT filter viruses which can incapacitate or kill just as quickly as can the bacteria it does eliminate. Carry purification tablets & a couple gallon sized double-ziplock baggies or an aluminum/titanium pot (multiple uses) or learn about SODIS instead. Why plan to fail?
Ideally, when traveling in the wilderness, it is best to carry multiple fire-starting tools, such as a lighter, matches, flint and steel, etc… Even with these implements starting a fire can be challenging in inclement weather. We highly recommend practicing fire starting in different weather conditions within different habitats. Good fire-making skills are invaluable. If you were to find yourself in a situation without a modern fire-making implement, fire by friction is the most effective primitive technique. Popular friction fire-making methods include bow drill, hand drill, fire plow, and fire saw.