If you want a colourful frozen drink for warm days, this Watermelon Slush Fizz is quick to make at home.
It combines Florida Syrups Sour Watermelon syrup with freshly carbonated water and crushed ice to create a fizzy, slushy-style drink with a sweet-and-sour watermelon flavour. It works well for sunny afternoons, birthday parties and family treats.
How Do You Make a Watermelon Slush Fizz?
The recipe is simple and makes two kid-sized servings.
Ingredients
- 30ml Florida Syrups Sour Watermelon syrup
- 200ml freshly carbonated water
- 2 cups crushed ice
- Watermelon slices or sour sweets for garnish
- A blender
- Two glasses or cups
If you do not have Sour Watermelon, the original recipe also suggests combining Raspberry and Lemonade syrups as an alternative.
Method
- Carbonate cold water using your SodaStream or similar home carbonation system.
- Add the crushed ice and Sour Watermelon syrup to a blender.
- Slowly pour in the freshly carbonated water.
- Blend for around 10–15 seconds, until the drink is slushy but not watery.
- Pour into two glasses or cups.
- Garnish with a watermelon wedge or sour sweet and serve immediately.
For a fruitier version, freeze some watermelon cubes and blend them into the drink.
Can You Make This with SodaStream?
Yes.
First, carbonate plain cold water using your SodaStream or similar home carbonation machine. Then add the carbonated water to the blender with the syrup and crushed ice.
Do not put the syrup or ice into the carbonation bottle before fizzing. Carbonate plain water first, then build the drink separately.
What Does a Watermelon Slush Fizz Taste Like?
Sour Watermelon combines fruity watermelon flavour with a sharper sour finish.
The crushed ice softens the flavour slightly, while the freshly carbonated water keeps the drink light and fizzy.
As a result, the finished drink sits somewhere between a fizzy soda and a frozen slush-style treat.
Why This Recipe Works Well for Kids’ Parties
The recipe is easy to scale up and only uses a few ingredients.
It also works well for:
- Sunny afternoons
- Birthday parties
- BBQs
- Family gatherings
- Weekend treats
- Garden parties
You can also let children choose their own garnish, such as watermelon slices, sour sweets or fresh fruit.
Can You Change the Flavour?
Yes.
The original recipe suggests swapping flavours or adding fresh fruit.
You could try:
- Raspberry + Lemonade
- Sour Watermelon + fresh watermelon
- Sour Watermelon + lemon
- Sour Watermelon + lime
Start with small amounts when combining flavours so you can adjust the balance gradually.
Is Florida Syrups Sour Watermelon Glycerol-Free?
Yes.
Florida Syrups home slush products are glycerol-free.
This recipe also uses crushed ice and carbonated water rather than relying on glycerol to create the frozen texture.
That makes it different from traditional slush concentrates that use glycerol to help maintain a slushy consistency.
Made in North East England
We develop and manufacture Florida Syrups in-house in North East England.
Our team handles:
- Product development
- Formulation
- Blending
- Filling
- Bottling
We also taste-test each batch and carry out quality checks before products leave our facility.
Frequently Asked Questions
How much Sour Watermelon syrup goes into this recipe?
Use 30ml of Florida Syrups Sour Watermelon syrup for two kid-sized servings.
How much sparkling water do I need?
Use 200ml of freshly carbonated water.
How long should I blend it?
Blend for around 10–15 seconds, or until the drink has a slushy texture without becoming watery.
Can I use SodaStream water?
Yes. Carbonate plain water first, then add it to the blender.
Can I use fresh watermelon?
Yes. Frozen watermelon cubes work well and add extra fruit flavour.
Can I use another Florida Syrups flavour?
Yes. Raspberry and Lemonade are suggested as an alternative combination in the original recipe.
Are Florida Syrups home slush products glycerol-free?
Yes. Florida Syrups home slush products are glycerol-free.
Make a Watermelon Slush Fizz at Home
This recipe is an easy way to turn Sour Watermelon syrup into a fizzy frozen treat.
Use 30ml Sour Watermelon syrup, 200ml freshly carbonated water and 2 cups of crushed ice, blend for 10–15 seconds and serve straight away.
Add fresh watermelon or a sour sweet for garnish, then enjoy it as a simple summer treat.
