How much water for a 20 mile walk?
                                
                                
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                                    5 min read                                
                            
                                According to seasoned thru-hikers, a general rule of thumb is to carry approximately 1 liter of water for every 5 miles of walking, meaning a 20-mile trek would require a minimum of 4 liters under moderate conditions. However, the precise amount of water for a 20 mile walk is highly dependent on a variety of personal and environmental factors.