I agree with Dmitry. Unless you confine your skiing to resort areas, emergency supplies are a must. Look up "ten essentials" and adapt to your situation. Things happen, equipment breaks, people get hurt or off trail or otherwise have problems. And as for water, be sure the container is well insulated and, if outside a resort, it is a good idea for someone in the group to carry a stove, fuel, and pan so you can melt ice or snow.
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