I have read and seen on television that bleach is the most important thing you can have with you in a survival scenario.1) Purify water2) Sanitize stuff3) Clean out wounds (with an EXTREMELY diluted solution)4) Flammable5) Miscellaneous usesI can start a fire on my own but I am positive books of matches would be available. #6, 7, 8, and 12 are not really necessary.Items 1-4, while are extremely vital