Disaster Water Triage Kit — Design Blueprint: Three-Stage Gravity Kit for the First 72 Hours

DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. Build-ready blueprint derived from 'A Post-Disaster Drinking-Water Triage Kit for the First 72 Hours' (DOI: 10.5281/zenodo.24108689). Specifies a 1.70 kg, 4.00 L, US$58.00 three-stage kit (settling and cloth, 0.50 m2 gravity ultrafiltration at 1.0 m head, NaDCC chlorination to 4.00 mg/L with 30-minute contact and tapped safe storage) producing 56.36 L/day of safe water on moderate 50 NTU water at 0.972 L per dollar per day, plus a four-train clinic variant (5.84 kg, US$196, 225.44 L/day, 45 people). Includes bill of materials with source-stated costs, sizing rules, assembly, commissioning by residual test, operating envelope by turbidity class, maintenance and consumables, failure modes, and the printed failure regime at full size: on extreme 500 NTU water chlorine demand exhausts the dose, virus removal falls to 2.0 log against a 4.0-log target, and safe output is zero.