This Spanish-language manual was developed to train Peace Corps volunteers and other community health workers in Spanish-speaking countries in oral rehydration therapy (ORT) and the control of diarrheal diseases. Using a competency-based format, the manual contains three training modules (organized in seven sessions) that focus on interrelated health education and technical content areas. Each module begins with a set of behavioral objectives and contains a sequence of sessions that address the specific content area. Session formats include targeted time frame, overview, objectives, resources, materials, procedures, and trainer notes. The modules cover the following topics: climate setting and assessment; diarrhea, dehydration, and rehydration; and nutrition and diarrhea. Extensive examples, sample forms, schedules, and handouts are provided. Materials are illustrated with line drawings. Suggestions to the trainer for adapting the materials for different countries and different learners are included in the training packet. (KC)