I tried to go to buy parts to help my cousin get her water back on yesterday, you could get anywhere near lowes or home depot. I went to the plumbing supply place and waited 30 minutes outside before going to the counter, talking with plumbers we are seeing crap no one thought could or would happen. Pipes on interior walls breaking, hot water lines breaking from leaving the cold running over night.
and to add insult to injury many cities have lost water completely (because people leaving water running to avoid broken pipes), extremely low water pressure and boil advisories where they still have water
It's hard for people in the South to judge how much water flow is needed considering in some places it got into negative degrees. I know in the Hill Country it got down to 6. At those temperatures, a slow drip from a faucet in a house without heat will cause the water to freeze on the inside wall of the pipe causing it to be insulated from any outside heat. In a short period of time that freezing will accelerate and then bust a pipe. Plumbers are going to be working overtime just to get people running water. I wouldn't be surprised to hear of more widespread price gouging seeing as it might take a month to get everything fixed.
Good luck man. The last thing I would want to fuck with in that cold is water.