Flavoring Your DIY Mix
Your formula is dialed in — right carbs, right ratio, right sodium. But it tastes like slightly salty sugar water. Commercial brands spend heavily on proprietary flavor compounds, but you can get 90% of the way with a few cheap, food-grade ingredients.
The osmolality tradeoff
Every dissolved particle you add — citric acid, fruit powder, sweetener — increases the osmolality of your drink. At 90+ g/hr, your osmotic budget tightens fast — especially with glucose-heavy carb sources. Maltodextrin and cluster dextrin give more headroom because a single polymer chain counts as one osmotic particle, not many. Adding too much flavoring on top pushes the solution hypertonic, which delays gastric emptying and causes GI distress.
This is one reason Maurten ships unflavored — they minimize non-fuel particles where they can. (Their primary carb-tolerance pitch is the alginate-pectin hydrogel mechanism, but the minimal-flavor profile fits the same low-additive philosophy.)
Five flavoring strategies
Four mirror a commercial sports drink archetype; the fifth is a DIY-only profile. Choose based on your carb target and taste preference.
Unflavored
Skip all flavoring agents — the drink tastes like slightly sweet, lightly salted water. Functional, not enjoyable, but the simplest approach for GI tolerance at 90+ g/hr. (Note: Maurten itself attributes its high-carb tolerance to its alginate-pectin hydrogel, not to being unflavored — but the minimal-additive profile fits the same philosophy.)
Just mix your carb sources + sodium. Done. If the taste is hard to tolerate, try sodium citrate instead of table salt — it softens the mineral edge without adding acidity.
Acid-Buffered
Light citric acid buffered with sodium citrate to bring the pH to a less aggressive ~4 (vs. ~2.5 for unbuffered citric). The result is a faintly tart, slightly salty drink that doesn't burn the gut over multi-hour efforts. Neversecond, Precision Fuel, Tailwind, and Skratch Super High-Carb all use this citric + sodium-citrate pattern because it minimizes GI irritation.
Add 0.5-1g citric acid + use sodium citrate as your sodium source (instead of or alongside table salt). The citrate buffers the acid, preventing the sharp bite. Add 0.25g malic acid for a smoother, layered tartness.
Naturally Tart
Citric acid for tartness plus 1-2 drops of food-grade essential citrus oil for aroma. The oil engages your olfactory receptors — your brain perceives a burst of lemon or orange, but the liquid is functionally identical to unflavored sugar water. This is the "cheat code" for flavor without osmolality cost. (Tailwind itself uses proprietary "natural flavor" compounds rather than retail citrus oil; this DIY route approximates the same light, tart citrus profile.)
Add 1-1.5g citric acid. Then add exactly 1-2 drops of food-grade lemon, lime, or sweet orange essential oil. Must be labeled "food grade" or "GRAS" — aromatherapy oils may contain extraction solvents. Shake well.
Whole-Food Flavored
Real fruit for flavor — actual lemon, lime, raspberry, or strawberry derivatives instead of synthesized flavor compounds. The most palatable option but adds real solute: trace sugars and (with whole powder) insoluble fiber. Skratch Sport Hydration uses freeze-dried fruit; Skratch Super High-Carb uses fruit juice + citrus oil. The DIY route swaps in freeze-dried fruit powder for convenience. Best for moderate carb loads — though Skratch's own Super High-Carb scales to 100 g/serving because cluster dextrin (HBCD), not the fruit, does the osmolality work.
Add 5-10g freeze-dried fruit powder (strawberry, mango, raspberry — available in bulk on Amazon). Add 0.5-1g citric acid or ascorbic acid (vitamin C) for tartness. Shake vigorously — fruit powder contains fiber that settles.
Sweetened Neutral
An acid-free formulation sweetened with pure stevia or monk fruit extract. No commercial sports drink ships exactly like this — Hammer Nutrition is closest in spirit (heavy stevia use) but their products still contain citric acid and xylitol. The DIY version delivers smooth sweetness with no tartness, which some athletes find easier on the stomach during ultras and gentler on tooth enamel.
Add 1-3 drops of pure liquid stevia extract OR ~20mg pure monk fruit powder. Avoid consumer stevia/monk fruit packets — they're bulked with sugar alcohols (xylitol, sorbitol, or erythritol) that load osmolality, and xylitol/sorbitol in particular ferment in the colon and trigger cramping. Source pure extract only. Omit all citric/malic acid.
Ingredient reference
All of these are available as food-grade powder or liquid on Amazon.
Practical tips
Essential oil safety
Only use oils explicitly labeled “food grade,” “GRAS,” or “for internal use.” Citrus oils are virtually all cold-pressed (not solvent extracted), but the real risks with non-food-grade product are oxidized limonene from poor storage, missing food-grade certification documentation, and — for cold-pressed bergamot specifically — high furanocoumarin content. Dose strictly: 1-2 drops maximum per 500ml. Overdosing causes mucosal irritation and a chemically abrasive taste.
The stevia/monk fruit polyol trap
Most consumer stevia and monk fruit products (packets, jar blends) are bulked with sugar alcohols — erythritol, xylitol, or sorbitol — to make them measure like sugar. Erythritol is the most tolerated of the three (~90% absorbed in the small intestine and excreted renally) but still loads osmolality at sufficient doses. Xylitol and sorbitol are far worse offenders during exercise because they ferment in the colon and are common triggers for cramping and diarrhea. For sports formulation, source pure liquid stevia extract drops or pure monk fruit extract powder with no sugar-alcohol filler at all.
Batch prep and shelf life
Dry mixes last indefinitely in sealed, low-moisture containers — shelf life is governed by moisture exclusion and oxidation, not by citric acid (which only acts as a preservative once dissolved). Essential oils are volatile and degrade over time; add them fresh to each bottle rather than into your batch-prepped dry powder. Freeze-dried fruit powder can clump in humid storage; keep it in an airtight container with a silica packet.
Flavor fatigue during long events
After 3-4 hours, even your favorite flavor can become nauseating. Brands like Tailwind and Precision deliberately engineer mild, subtle profiles for this reason. If you're preparing for an ultra, err on the side of too bland rather than too flavorful. Essential oils work well here — they engage your nose (olfaction) rather than saturating your taste buds, avoiding the sensory overload that triggers rejection.
Apply a flavoring strategy to a specific brand
Each brand below uses one of the five strategies above. The DIY teardown shows the exact recipe and the honest read on what the branded version adds.
- DIY MaurtenDrink Mix 320
Unflavored approach — the canonical example. At 80g carbs per serving, the only non-carb solutes are sodium and the alginate/pectin hydrogel agents.
- DIY NeversecondC30 Energy Gel
Acid-buffered gel. Light citric acid + sodium citrate keeps the pH friendly over multi-hour fuelings.
- DIY Tailwind NutritionEndurance Fuel
Naturally tart, all-in-one scoop. Citric acid plus citrus flavor carried entirely by dextrose-sucrose sweetness.
- DIY Skratch LabsSuper High-Carb Sport Drink Mix
Real-fruit flavor (lemon/lime juice + citrus oils) on top of cluster dextrin. The HBCD does the osmolality work; the fruit is just for taste.
Ready to try it?
Open the builder, add your carb sources, then add citric acid or malic acid from the ingredient picker. Everything else (oils, sweeteners, fruit powder) can be added off-tool.
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