Bright, citrusy, and endlessly refreshing, this homemade sparkling water is the kind of drink that makes you wonder why you ever reached for a store-bought can. A simple grapefruit syrup — made by gently dissolving sugar with fresh grapefruit juice and zest — gives the whole thing a vibrant, slightly bitter edge that feels genuinely grown-up. The syrup steeps off the heat so the zest has time to deepen the flavor before it gets strained out, leaving behind a beautifully clear, fragrant liquid. Once it meets the chilled sparkling water, you get that satisfying fizz with real citrus character behind it. Every ingredient here is naturally grain-free, so there's no need to scan labels or second-guess anything — just fresh fruit, sugar, water, and bubbles. Serve it over ice with a grapefruit wedge on the rim and it looks as good as it tastes, whether you're hosting brunch or just treating yourself on a Tuesday.
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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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