Juice the citrus. Squeeze 1–2 tablespoons of lemon, lime, or orange into a large glass or bottle. Strain seeds if you're picky.
Add the salt. Start with 1/8 teaspoon. Taste later and bump up to 1/4 teaspoon if you sweat heavily or it's blazing hot.
Mix in maple syrup. Add 1–2 teaspoons. More for intense workouts, less for casual walks. Stir to dissolve.
Pour in cold water. Top up with 16–20 oz. Stir or shake until crystal clear.
Customize. Add ice, a splash of coconut water, or a tiny pinch of baking soda if you like a softer taste. Don't go wild—pinch means pinch.
Taste test. It should taste lightly salty-sweet with a bright citrus edge. If it tastes like the ocean, you overdid the salt. Adjust.
Drink smart. Sip during or immediately after activity. If you chug it in 10 seconds, that's on you, champ.