sardog1
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There's at least one other option, and it's the one I believe has the most versatility and the greatest probability of success: carry some kind of shelter that is light weight and easy to set up for a group of people.
You're right that with the right insulation underneath and with enough warm bodies, a lightweight emergency shelter can do the job. They're far more popular in the UK and Scandinavia than here. An example is the Hilleberg Windsack.
Some of us carry the Blizzard Survival Bag.