1.11

According to the problem description, 1L is ingested as food, 0.3L are produced metabolically, 0.05L inhaled, 0.4L exhaled, 0.2L lost to sweat, 1.4L lost to urine, 0.2L lost to feces, and 0.35L lost through the skin. Simplified, this is represented as -1 - 0.05 + 0.4 + 0.2 + 1.4 + 0.2 + 0.35 liters lost each day, which comes to 1.5L, meaning one must drink 1.5L of water each day to maintain steady-state condition