By JANESS ANN J. ELLAO Bulatlat.com SAN MATEO, Rizal — Marivic Cristobal has been living in Barangay Sta. Ana, San Mateo, Rizal province for almost 20 years now. She is used to a home where floodwater would easily rise from the slightest rainfall. Cristobal learned how to keep important things and documents safe from the…