A six-year resident of San Miguel de Allende, she specializes in architectural design with reeds and is an active promoter of reed construction. Casilda promotes gray water recycling with biofilters and natural wetlands. She spent six years working in Chiapas with these technologies while designing and building a network of micro community health clinics in Zapatista communities. She also participates in Initiatives for Nature -- INANA, another civil organization. Casilda designs learning materials and community outreach strategies for Caminos de Agua.