Forget fancy apps. The “pluck and pinch” test works: gently pinch the skin on the back of your hand for two seconds. If it snaps back quickly, you’re hydrated. If it stays tented for a beat, down a glass.
Another low-tech trick: check your eyelids. If your eyes feel gritty or dry, you’re likely behind. That’s your body’s not-so-subtle glare at your water bottle.
And one last gem: listen to your joints. Cartilage is about 80% water. When you feel creaky or stiff, it’s not just age—it’s thirst. Hydrate before you grumble.
