Chlorine tablets are often a good choice for water treatment in emergencies because they are widely available, cost-effective, easily transported, and simple to use. However, the availability of multiple tablet sizes in an emergency can result in users treating their water improperly, and some doses may be unpalatable to users. This document provides tools to assess water needs in an emergency and make a recommendation for the best chlorine tablet to avoid confusion and provide water that users will accept. This approach may also be used even when only one tablet size is available to inform use of that tablet. This includes activities that assess: 1) water quality, 2) recipient context, 3) taste and odor thresholds, and 4) local context, and the coordination of a recommendation based on these parameters.