Water Tracker

Tracks daily water intake from casual mentions and sets hydration targets from weight, exercise, heat, and health context. Use when the user logs a drink ("had a glass", "finished my bottle"), asks how much water they should drink or whether they drink enough, reports thirst, dark urine, dry mouth, cramps, or a headache that could be dehydration, plans fluid or electrolyte replacement for workouts, races, sauna, hiking, flights, or hot weather, or needs rehydration guidance during fever, vomiting, diarrhea, or a hangover, or asks whether tap, bottled, filtered, mineral, or sparkling water is safe or better. Not for meal or calorie logging.