Bright, citrusy, and endlessly refreshing, this homemade sparkling drink is the kind of thing that makes plain water feel like a distant memory. A simple syrup made from fresh grapefruit zest and juice gives it a bold, aromatic punch that no store-bought version can quite match. For anyone managing a nickel sensitivity, commercial flavored waters and sodas can be a minefield of mystery additives and ingredients sourced from high-nickel foods — this recipe sidesteps all of that with a short, clean ingredient list you can trust. Granulated sugar, water, and fresh grapefruit are all you need to build the syrup, and the sparkling water keeps things light and celebratory without any hidden surprises. Steeping the zest into the syrup before straining it out is the move that makes this taste genuinely sophisticated, not just sweet. Serve it over ice with a grapefruit wedge on the rim and it looks as good as it tastes — perfect for a weekend brunch, a dinner party, or just a Tuesday when you deserve something a little special.
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Combine the sugar, water, grapefruit zest, and grapefruit juice in a small saucepan over medium heat, stirring until the sugar is fully dissolved, about 3–4 minutes. Do not boil.
Remove from heat and let the syrup steep for 15–20 minutes, until cooled to room temperature and the zest flavor has infused.
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