Or it could be three days after I run out, ya know, when I'm dead or dying.
Who knows how long it will be before I find another source? It could be at my current destination, for all I know. I have to be careful with how much water I drink, too. As long as I used stealth, watched where I was going, listened for booming footsteps, choking noises, and that disembodied, obnoxious crying, I would be fine.
Travelling this late at night in a zombie apocalypse probably wasn't the best idea, but with my supplies dwindling down to a mere half bottle of water and a handful of bullets, I wasn't going to last much longer.