The key phrase here is "increase your odds" If you don't have several days worth of water then you are well and truly fucked no matter what you do. If you do h

The key phrase here is "increase your odds" If you don't have several days worth of water then you are well and truly fucked no matter what you do. If you do have several days worth of water then your odds of surviving just went way up, even if they still aren't great. The same logic applies to having food, first aid supplies, guns, etc.