In some emergency scenarios, water from the Polnell Landing Water System could be rendered unavailable or not suitable for drinking. 
For emergency purposes, the CDC, FEMAand the American Red Cross all recommend having one gallon of water per day per person for a two-week period.
In some scenarios, such as a severe earthquake in our area, emergency help to our island could be delayed up to an entire month, so plan accordingly.
Link to WA State Department of Health Office of Drinking Water Emergency Response Planning Guide for Public Drinking Water Systems.