Boiling and filtering are effective ways to make water safe for drinking while backpacking. Boiling is the simplest method, requiring no special equipment or chemicals. Bring your water to a rolling boil for one minute, and you can drink it safely. However, this method is not ideal for larger groups, as it takes time and energy to heat the water. Filtering is a more efficient method requiring less time and energy, but it requires a water filter. Be sure to select a filter that meets your needs and budget.