When you drink one glass of water, your body lights up from brain to muscle. Green stage. Glass up. Skin fades; anatomy locks into view. Sip. Water slides down the esophagus into the stomach; rugae ripple and settle. Zoom in: villi reach, pulling in H2O and electrolytes; capillaries carry the charge across the map. Brain clears; synapses sync and fire clean. Muscles glide; contractions stay smooth; cramp risk drops. The gut microbiome hums; peristaltic waves roll on time. Heart pressurizes the flow; lungs trade gases; kidneys balance and filter. Pull wide: organs and muscle groups glow with a steady, quiet power. Hydration doesn’t shout—it keeps everything on beat. But dirty water flips the script. Microbes and pollutants ride the same pathways—bacteria, parasites, viruses. E. coli, cholera, dysentery, typhoid, hepatitis A, giardia. The result: cramps, vomiting, diarrhea, and dehydration that can turn dangerous fast. Choose clean, safe water. Sip smart. Keep the system bright.