In the game NEO Scavenger, you can scavenge 'water sources' (Like rivers, lakes and...Puddles) well I'm not suggesting the rivers and lakes, but what about scavenging puddles of water when it rains (And for a few hours after it rains) to fill water bottles with (Or when really desperate, to drink directly from)?
I remember reading on the forums a character who ended up dying of thirst in a rainstorm in the woods. Seems like it could be fixed.