For my kits I like to use a standard 32oz waterbottle with a stainless steel cup that fis snugly on the bottom of the bottle. You can carry water and heat it up in the cup over any small stove or fire. You can also purify any water you find by boiling it in the cup and storing boiled water in the bottle.
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In a crisis one does not rise to one's level of expectations but rather falls to one's level of training.