well, during an out break, the first thing i would do is head to my upstairs and fill all sinks and tubs with water, because you may not know when the water is cut, then i would move all my supplies up and destroy the stairs.
You would probably be able to know that zombies were surrounding your house a little earlier than right when they attack so you could set up stronger barricades across the doors and windows really quick and then I'd get my guns and ammo and food and stuff and hightail it upstairs. Then I'd move my bed and anything else I could find in front of the stairway (right after taking the top few stairs off) and just wait. Unfortunately I didnt get that chance when the zombies attacked our house...