Survival skills
A human being can survive an average of three to five days without the intake of water. The issues presented by the need for water dictate that unnecessary water loss by perspiration be avoided in survival situations. The need for water increases with exercise.
Stained Glass (TV series)
Back at the chalet, Gi-tae kept coughing out blood and used a towel to wipe away his blood. He later joined Ji-soo in a conversation and told her a story of a person who had lived for 99 days without food, but why couldn't he lived up to the 100th day? As he said these, Ji-soo thanked him for his dedication towards her and hugged him.