Watermelon Grapefruit Combo Review: A Refreshing Twist on Hydration

If you’re a fan of flavored boxed water, you’ve probably tried a single fruit flavor and thought, “What if I mixed two?” That’s exactly what we did with the Watermelon Grapefruit Combo. While Boxed Water doesn’t sell this as a pre-packed blend, combining their 250ml Watermelon Boxed Water with the 500ml 24 Pack Grapefruit creates a surprisingly harmonious duo that’s perfect for warm afternoons or post-workout refreshment.

We put this pair to the test in a casual taste test to see how the sweet, mellow notes of watermelon balance with the sharp, citrusy tang of grapefruit. Spoiler: the result is a well-rounded, not-too-sweet drink that feels more like a spa water than a sugary juice. Below, we break down each flavor, how they work together, and the best ways to enjoy the combo.

Taste Profile: Watermelon (250ml Box)

Boxed Water’s Watermelon flavor in the 250ml size is a light, subtly sweet option. It captures the essence of fresh watermelon without being cloying—no added sugar, just a hint of natural fruit essence. The mouthfeel is clean, and the flavor lingers just enough to remind you you’re drinking something special. It’s a fantastic standalone choice for kids or anyone who prefers a delicate fruit taste.

Because the watermelon is so gentle, it doesn’t overpower other flavors when mixed. That makes it an ideal base for a combo. If you’ve ever found plain water boring but don’t want a heavy syrup, this single flavor is a great starting point.

Taste Profile: Grapefruit (500ml Pack)

The Grapefruit flavor from Boxed Water’s 500ml 24 Pack offers a bolder, more assertive citrus note. It’s tart and slightly bitter in the way good grapefruit should be, with a clean finish that doesn’t leave a sugary aftertaste. This flavor stands out on its own and pairs well with meals, especially salads or grilled fish.

What’s impressive is that the grapefruit is still light enough to be hydrating—it’s not overpowering like some commercial flavored waters. That restraint makes it a good candidate for mixing, as it adds a zesty kick without dominating the glass.

Why the Watermelon + Grapefruit Combo Works

When you combine these two, the sweet mellowness of watermelon softens the sharp edges of grapefruit, while the grapefruit’s acidity brightens the watermelon’s subtle flavor. The result is a balanced, refreshing drink that tastes more complex than either alone. It’s reminiscent of a fruit salad in liquid form—clean, crisp, and hydrating.

We found this combo especially enjoyable over ice with a splash of club soda for a bubbly twist. If you’re looking for a zero-sugar, flavored water alternative that feels like a treat, this blend is a winner. It’s also a great way to introduce non-water drinkers to the world of boxed water without shocking their palate.

• Try adding a few mint leaves or a slice of lemon to elevate the freshness.

How to Create Your Own Watermelon Grapefruit Combo

You don’t need any special tools—just grab a 250ml Watermelon Boxed Water and a 500ml Grapefruit Boxed Water from the store. For a single serving, pour half a box of each into a glass (about 125ml each) and stir gently. Adjust the ratio to your preference: more watermelon if you like it sweeter, more grapefruit if you want extra zing.

If you’re prepping for a party, you can mix larger batches in a pitcher. The flavors hold up well for a few hours in the fridge, making this a simple, no-sugar cocktail base. For an adult version, it pairs nicely with a splash of vodka or gin, but it’s equally delicious on its own.

• Chill both boxes before mixing for the best taste.
• Stir, don’t shake—you want to preserve the carbonation (if any; these are still waters, not sparkling).

How It Compares to Pre-Mixed Combos

Boxed Water offers several ready-made fruit combos, like the Cucumber Lemon Combo and the Blackberry Cucumber Combo. These are convenient if you want a single-box solution. The Cucumber Lemon is more herbal and refreshing, while the Blackberry Cucumber is slightly sweeter with a berry finish.

Our homemade Watermelon Grapefruit combo occupies a different space: it’s brighter and more citrus-forward than the cucumber-based options, making it ideal for summer mornings or post-exercise rehydration. If you love grapefruit but crave a touch of sweetness, this DIY mix is hard to beat. Plus, buying the two separate packs gives you flexibility to enjoy each flavor on its own when you’re not in the mixing mood.

The Watermelon Grapefruit combo doesn’t come prepackaged, but it’s one of the most enjoyable flavor pairings we’ve tried from Boxed Water. The light sweetness of watermelon balances the tart grapefruit beautifully, creating a subtly complex drink that keeps you reaching for another sip. Whether you use it to kick off a hot day or as a fun mixer for guests, this duo proves that sometimes the best combinations are the ones you invent yourself.