As your stored water is used up, you will need to find more water. Unless you have access to a close, reliable well, it will need to be both filtered and purified for safe drinking.
If you are already using a well, you may be able to get water. You may have to open it, and remove the pump. Here at two options:
Consider these sources. It would be best to scout out where these sources may be now and to consider how water can be transported if fuel is scarce or prohibitively expensive.
The "Gilmore" 2-bucket System. This system is very simple and can be made in 10 minutes. It is easy to store and requires no mechanical skill. Except for the filter, all materials can be found locally, and the buckets are often free from bakeries. This is an excellent project for someone new to preparing.
If you have no commercial filtering system, consider a slow sand filter, Go to the ‘Water Treatment FAQ’ in the downloads section of this website. A description and construction details are in the 'Slow Sand Filter' section.