Solely boiling water in the wild is not recommended, as while boiling water may kill bacteria, it does not rid the water of iron, calcium, plastics, sewage chemicals, et cetera. It is instead recommended that you use sanitizing pills, straws with built-in filters, or homemade filters (with the ladder option only being viable given that you know how to make them). -Hermann Hans Otto Georg-Wilhelm Müller von Magdeburg und Hanover