People who depend on a well for their water have learned to fill up up all available pots and pans when a thunderstorm is brewing.
What would you do if you knew your water supply would be disrupted for a few hours, or a day or two?
Assuming you don’t already have long term water preps (or you don’t want to use them up) here are a few options in addition to filling your pots and pans.
The simplest option is to put two or three heavy-duty plastic trash bags (avoid those with post-consumer recycled content) inside each other. Then fill the inner bag with water. You can even use the trash can to give structure to the bag. (A good argument for keeping your trash can fairly clean!)
Fill your bath tub almost to the top. Without a waterBOB Emergency Bathtub Water Storage, you won’t want to drink this water, but it can be used to flush toilets, wash your hands, etc.
Shut off the breaker to your hot water heater and drain it into buckets and other containers (caution: surprisingly enough the water inside hot water heaters is HOT)
If you are at home, a fair amount of water will be stored in your water pipes and related systems too. To get access to this water, first close the valve to the outside as soon as possible. This will prevent the water from running out as pressure to the entire system drops and prevent contaminated water from entering your house.
Then open a faucet on the top floor. This will let air into the system so a vacuum doesn’t hold the water in. Next, you can open a faucet in the basement. Gravity should allow the water in your pipes to run out the open faucet. You can repeat this procedure for both hot and cold systems.
As mentioned above your hot water heater will also have about 40 gallons of potable water inside it. You can access this water from the valve on the bottom. Again, you may need to open a faucet somewhere else in the house to ensure a smooth flow of water.
Sediment often collects in the bottom of a hot water heater. While a good maintenance program can prevent this, it should not be dangerous. Simply allow any stirred up dirt to again drift to the bottom.