Hard Nutrl Seltzer Watermelon Recipe

Measure and chill

Chill the vodka and sparkling water thoroughly in the refrigerator. Keep sparkling water cold to preserve carbonation when mixing.

Combine 1.6 cups chilled vodka with 6 cups chilled sparkling water in a large sanitized mixing pitcher or container. Stir gently to combine — do not vigorously agitate to preserve carbonation.

Prepare fresh watermelon

Remove rind and seeds from watermelon and roughly chop. Place the chopped watermelon into a blender and puree until smooth (about 30–45 seconds).

Strain the puree through a fine mesh sieve or cheesecloth into a bowl, pressing with a spoon to extract juice. You should yield roughly 1 cup of clear juice from about 2 cups chopped fruit.

If using a concentrate/syrup, add 2 tablespoons for more pronounced watermelon flavor. Add 2 teaspoons fresh lime juice to the watermelon juice to brighten the flavor.

Taste the watermelon mixture. If it tastes weak, you may increase concentrate or reduce sparkling water slightly when blending (see final assembly).

Add 2 tablespoons simple syrup to the watermelon-lime mixture and stir until fully combined.

Add 1 teaspoon citric acid solution (or 1 teaspoon lemon juice) to adjust tartness and help brightness. Stir and taste; the final drink should be balanced between light sweetness and gentle acidity.

If you plan to package the drink for short-term shelf storage (several days to weeks) and want minimized fermentation or microbial growth, optionally add 0.1 tsp potassium sorbate and 0.05 tsp sodium benzoate dissolved in a tablespoon of water. These are optional and used only if making for storage; skip if consuming fresh.

Combine the prepared watermelon flavor mix with the vodka + sparkling water mixture. Pour the alcohol/water mix into a wide pitcher and gently fold in the watermelon mix. Do this slowly and gently to retain carbonation. Taste and adjust: add a little more simple syrup if not sweet enough (up to 1 more tablespoon), or a splash more lime if too sweet.

If you used ice to chill and diluted while mixing, account for dilution (the recipe accounts for approximately 4.5% ABV in a 12 oz finished can when properly measured). If the mix is too flat from ice melt, top up with additional chilled sparkling water.

Sanitize and chill 12-oz cans or bottles thoroughly. Using a bottling funnel or counter-pressure filler, fill each 12-oz can leaving minimal headspace (about 0.5 inch). Immediately seal/can to preserve carbonation. If you do not have canning equipment, pour into chilled bottles and cap tightly.

Place filled cans upright in refrigerator. Chill for at least 2 hours before serving. Consume fresh within 5–7 days if no preservatives were added; with sorbate/benzoate and proper sanitation, shelf life may extend but remains limited.