First off, Why would I have gone out on a hike without bringing someone with me, or telling someone where I'd be before hand? That's just piss poor planning. Drink my own piss or boil some stream water to deal with the water problem. Then I climb a tree to see if I can see anything, like a road, trail, or a ranger station, assuming its still light out, otherwise, I set up camp and wait till morning. (optional: wait for dark, then watch for lights.) If I decide to move out, I mark my trail every few yards to ensure I don't wander in circles, and also check cell reception, just in case. Also taking regular breaks to prevent exhaustion. Food isn't a priority... you can go a while without it.