Feel free to delete this,

Or if you feel really, really daring, you can wait (possibly for a really long time) for a crater to shoot out boiling water (which would be heated to high above the normal boiling point, because the pressure under the ground would prevent it from evaporating, causing it to heat up way past 100C/212F while retaining liquid form) and gather some in a container of some kind, in the process risking losing random parts of your body to third-degree burns, and then bury it in snow until it cools down enough to drink. Or until it melts all the snow around it, which depending on the temperature is possible.

But that is highly unlikely and probably impossible to do without scorching yourself multiple times. 'Sides, the water would be all sulfur-y and full of minerals and gross, and although I doubt someone dehydrated far enough would care it probably wouldn't be great for you.

So. ^^

I try. ^^