UPDATE: As it turns out, this story is complete bullshit. Slapnose apologizes for the error and promises to investigate all urine-related stories more carefully from now on.
Mercifully, he had stocked up on essential supplies of alcohol and quickly formulated a cunning plan: "I was scooping the snow from above me and packing it down below the window, and then I peed on it to melt it. It was hard and now my kidneys and liver hurt. But I'm glad the beer I took on holiday turned out to be useful and I managed to get out of there."
Rescuers eventually found Kral staggering drunk on a mountain path four days after his ordeal began.
They don't mention how long it took him to get through 30 liters of beer (nearly 10 gallons). It's a singularly heroic feat regardless.