Fountain Soda Recipe

Chill components

Chill the carbonated water and the soda syrup in the refrigerator for at least 1–2 hours before mixing. Cold ingredients reduce foaming and preserve carbonation.

Measure out the syrup and carbonated water. Standard commercial fountain ratio is approximately 1 part syrup to 4 parts carbonated water (adjust to taste or follow syrup manufacturer's recommendation). For this recipe use 3 cups syrup to 12 cups carbonated water.

Slowly combine syrup and carbonated water. In a pitcher, pour the measured syrup first, then gently pour the carbonated water down the side of the pitcher or use a bar spoon to reduce agitation. Stir once gently with a long spoon to combine — avoid vigorous stirring to preserve carbonation.

Taste and adjust sweetness/strength. If the soda tastes too strong, add small increments (1/4 cup) of carbonated water. If too weak, add up to 1/4 cup more syrup. For flavored variation, stir in up to 1 teaspoon of an additional flavored syrup (vanilla, cherry) then re-taste.

Prepare glass with ice if desired. Fill a tall glass about 1/3–1/2 full with ice cubes (about 1 cup). Note: adding ice will slightly dilute the drink as it melts.

Pour soda slowly into the glass. Tilt the glass and pour down the side to minimize foam. Fill to about 1/2 inch from the top to allow for garnish and any fizzing.

Garnish. Squeeze a wedge of lemon or lime over the top if desired and drop it in. Add a maraschino cherry or a 1 tsp float of extra flavored syrup for an old-fashioned fountain-soda touch.

Serve immediately. Provide a straw or spoon for stirring. If storing leftover soda in refrigerator, keep in a sealed bottle to retain carbonation and consume within 24–48 hours for best effervescence.