Reusing Purification Water
Can you re-use water used for purification–wudoo or ghusl? This issue doesn’t apply to most people unless they’re stuck somewhere without much water–like Cambodia, where they get water once a year, during flood season, and keep it for nine months.
(Before you read this, read about the three-fold categorization of water; in summary, water can either be purifying (tuhoor), pure (taahir), or impure (najas), and we can only use purifying water for wudoo and ghusl.