Hopefully they brought a stove on their one day attempt...
and enough gas for a week on their one day attempt.
Hopefully, but if not there are other ways to hydrate while sitting in a snow cave.
I'm getting a real laugh from you, you must think these experienced mountaineers are completely clueless about the outdoors.
Whereas I can guarantee you that anyone who's climbed Denali is a real pragmatic hard-a&&.