Grapefruit soda
Grapefruit soda is a mixer with no alcohol in it, used in 1 drink on this site.

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A bottle of Squirt grapefruit soda beside a glass poured with pale soda
Composition
Open Food Facts · 0078000016406. Squirt grapefruit soda (Open Food Facts, ODbL) as a representative bottling. Squirt is the brand most Paloma recipes name outright. Its ingredient list (carbonated water, high fructose corn syrup, grapefruit juice concentrate, natural flavors, citric acid) checked against the producer and is entirely plant-derived, so animalOrigin is none. Density has no liquid measurement on file and is taken from the water-like class in density-classes.json, marked estimated. acidPercent left off beyond the citric-acid mixer default: no titratable acidity source exists.
Used in these drinks
most firstSubstitutes
Grapefruit juice: Loses the carbonation and the extra sugar; top with soda water to bring the fizz back.
A general substitute is a browsing aid rather than a drink-specific claim. Where a particular drink has a substitution worth making, it says so on its own page and recomputes the spec for it.