Portable filtration units are available at sporting and other stores. They are intended for use by hikers, and are usually effective at removing suspended solids and bacteria. This information does not focus on Y2K but describes preparations that are appropriate for most potential emergencies. EPA Water and Wastewater Y2K site describes what EPA is doing to make sure that safe drinking water and effective wastewater treatment will not be interrupted. Y2K web site provides information for water utilities as well as a survey of Y2K readiness by water supplies.
Many web sites focus on surviving the millenium.
None should be considered authoritative as they have no formal review. However, they may provide ideas you find helpful.