This probably isn't important at all to the game, but it's just a minor detail that I noticed. When you find a canteen, the maximum volume of water it holds is apparently 10 milliliters. Each swig that you take is only about 2mL. It works for the game, it's just not realistic.... 10mL of water is like one mouthful, or even less. For realism, I would increase the volume of the canteen to 1 Liter, or 500 milliliters and Each "swig" should be increased to 50-100 milliliters. Again, not at all important to the game play, it's just something that I noticed.