Kill the water to your house and drain all lines to the best of your ability.
This is the choice I had to make just a few minutes ago. One cold water line in the kitchen has developed a leak, probably ruptured. I shut off our water out at the meter because I've heard how much a big leak can cost. Now the rest of the plumbing will freeze because I can't keep a trickle going. There are no good choices here.
