Our plan is to use the motorcycle (if that bad) and go to the (2) nearby man-made lakes and use our filters.
The one thing I've never seen on Prepper Shows or Prepper threads, is the fact that every household has 50 gallons of potable water in their hot water heater (not to mention their toilet tanks). If not end world, that alone could last until services are restored. Attach a short length of hose to the drain outlet and you have drinkable water.
For hygiene, think baby wipes. We always have a supply of "Mom To Mom" unscented baby wipes.
In San Francisco the use of a water heater as a water source is well known or at least should be but my SIL experienced a strange phenomena when a water main down the hill from her ruptured. The break apparently caused a negative pressure situation in the local area water lines. She had a good portion of her water heater suctioned dry. Once the main was fixed the water heater refilled. In the event of an EQ water main breaks will be common. I think it might be wise to listen to your water supply line and you hear the sound of water flowing even though you have none on then shut off the cold water input to the water heater to avoid siphoning off of your emergency supply.