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    Watermelon Energy Cooler (Energy Drink Version)

    The BYOB Team5 min1 drink (16oz)~$1.45/drink -- a sugar-free energy drink and fresh watermelon47 cal/serving

    Ingredients & steps

    Standard

    Ingredients

    • 8oz sugar-free energy drink (e.g. Celsius, Bang, or Reign)
    • 3oz fresh watermelon, cubed and seeds removed, blended into a puree
    • 1 tbsp cane sugar simple syrup (1:1 sugar and water, cooked until dissolved and cooled)
    • Ice (enough to fill a 16oz glass)

    Steps

    1. 1.Blend the watermelon into a smooth puree.
    2. 2.Fill a 16oz glass with ice.
    3. 3.Pour in the energy drink and stir in the watermelon puree and simple syrup. Serve immediately with a straw.

    Not medical or nutrition advice. Calorie figures on this page are estimates based on typical ingredient values, not a lab analysis of your exact batch — they'll shift with the brand of milk, syrup, or protein powder you actually use. "Ingredient-Honest" and "sugar-free" describe what's in the recipe, not a health claim. If you're managing diabetes, a caffeine sensitivity, pregnancy, or another condition, check with a doctor or dietitian before making a recipe part of your routine. Read the full disclaimer.

    The cheapest of the energy builds in this lineup, since whole watermelon is genuinely one of the least expensive fruits by the ounce at most grocery stores. Real blended watermelon plus a real sugar-free energy drink for the caffeine — no coffee, no espresso.

    Building the Drink

    1. Blend 3oz watermelon into a smooth puree.
    2. Fill a 16oz glass with ice.
    3. Pour in 8oz sugar-free energy drink and stir in the watermelon puree and 1 tbsp simple syrup.
    Drive-Thru Watermelon Energy Drink vs. Home Version
    Drive-thru watermelon energy drink (16oz, tax included)~$6.50
    Home version (energy drink, watermelon, syrup)~$1.45
    Savings per drink$5.05

    Assumptions: a 16oz drive-thru energy drink (pricing varies by region and chain), a single sugar-free energy drink can, whole watermelon priced per-pound and broken down to usable flesh weight, and homemade simple syrup at typical grocery pricing. At 5 of these a week over the site’s standard 48-week year, that’s roughly $1,212/year back in your pocket versus buying it out.

    Swaps & Notes

    • Buy watermelon whole, not pre-cut, for the lowest per-ounce cost — see our Watermelon Lemonade Cooler for more on the math there.
    • Blend the watermelon fresh per drink — like the lemonade version, blended watermelon separates and loses texture if it sits too long.
    • Want the caffeine-free version? See our Watermelon Lemonade Cooler instead.

    Recipe Card Summary

    Watermelon Energy Cooler

    • Sugar-free energy drink, blended watermelon, and a touch of simple syrup, over ice
    • Prep time: 5 minutes · Total: 5 minutes
    • Cost: ~$1.45/drink vs. ~$6.50 drive-thru equivalent
    • Caffeine source: a real canned energy drink, not espresso — no coffee in this recipe

    FAQ

    Why is this the cheapest energy drink in the lineup?

    Whole watermelon is genuinely one of the least expensive fruits by the ounce at most grocery stores, especially in season — the energy drink itself is the dominant cost in every recipe in this family, and watermelon simply adds the least on top of it.

    How much caffeine does this have?

    Roughly 130-135mg from the 8oz portion of a typical 200mg/12oz sugar-free energy drink, similar to a strong double espresso shot — exact amounts vary by brand.

    Can I skip the simple syrup?

    Yes — the energy drink and watermelon still carry real flavor without it, just noticeably less sweet, which some people prefer.

    Keep exploring

    Browse by ingredient tier

    Or skip this drink and explore every recipe in the Ingredient-Honest, Standard, or Sugar-Free lineup.

    Browse more Cooler recipes →