PlainWater - Water Safety

Water is the most basic thing every human — and every animal — needs after oxygen. Yet the expertise to find, test, and make water safe to drink is normally locked behind labs, NGOs, and public-health departments. PlainWater puts it directly in your pocket, offline — because the roughly 2 billion people who need it most often have no signal and no money for a lab test, and even in wealthy countries, boil-water advisories and disasters knock out safe water routinely. 82 features across 8 modules, entirely on-device: • PURIFICATION — boiling (altitude-adjusted), bleach/chlorine dosing calculator, purification tablets, SODIS, filtration, distillation, DIY builds (biosand, ceramic pot), and more — every method with exact, sourced numbers, not rules of thumb. • ILLNESS & REHYDRATION — symptom guides for cholera, giardia, dysentery, typhoid; a red-flag triage that tells you when to seek help…