Speaking from personal experiance:
In arctic conditions, which is what you are dealing with, carry your water in a couple of 1 to 2 litre steel thermos flask's. Increase the flask's insulation by wrapping a section of foam mat around it.

An axe might have been a usefull addition as well. You could chop through the ice in a couple of minutes. Cover the hole with pine bough's and snow (if available) to stop it refreezing.

You need to keep the tent walls away from you. Try using long poles in an x shaped configuation.