An inactive person requires a minimum of how many liters of water a day to keep all body systems functioning properly? Fundamentals of Search and Rescue An inactive person requires a minimum of how many liters of water a day to keep all body systems functioning properly? A. 1-2 B. 2-3 C. 3-4 D. 4-5 Answer: A Share this Share on FacebookTweet on TwitterPlus on Google+