I like the tips for the candle in a soda can and making a lantern using olive oil the best.
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7 Survival Life Hacks that could help save your life in a survival situation. Any tip for filtering water is always useful as well as drinking unpurified water is one of the quickest ways to bring misery to yourself when trying to survive. Boiling water is always recommended if you have a fire and container to use or be prepared with a Personal Water Filter.