Well, the hot sauce would at least provide electrolytes.

Given this photo of the vehicle, I suspect carbon monoxide was the greater hazard.



Source: http://time.com/5542542/oregon-taco-sauce-man-missing/


But a free year of Taco Bell? That might create an entirely new survival situation.

Thirst probably wasn't a big issue. He had a source of warmth (at least so long as his auto gas held out), so he could probably contrive a means to melt snow. Nothing wrong with eating snow, either, except that it tends to chill one. But again, he had a means of rewarming with his car heater. And snow in the Oregon Cascades tends to have a high water content (though not always on the East side where he was). This means one usually doesn't need to melt or eat as much to stay hydrated.

LOL


Yes! Carbon monoxide is a very serious hazard when running a car engine for heat, when the car is parked in a blizzard. If you ever need to do that, you absolutely must get out periodically to make sure the tailpipe isn't getting buried in such a way that CO will get into the car!

Aside from that, the heffalump in the room is: how did he disappear for five days without anyone noticing?

Likely the same old answer ... "a three hour tour / a three hour tour."

At least he had the sense to stay with his vehicle.

(Given my impromptu adventures when I was young and immortal, I'm not in a hurry to cast stones. )