Can a homemade electrolyte drink replace sports drinks?

Homemade electrolyte drink — basic recipe:

• 1/4 teaspoon salt (sodium chloride) — provides ~590 mg sodium
• 1/4 teaspoon potassium chloride (sold as "No Salt" or "Nu-Salt") — provides ~650 mg potassium
• 1 tablespoon lemon or lime juice — flavor and trace minerals
• 16-24 oz water

For added magnesium, stir in 1/4 teaspoon of magnesium citrate powder (Natural Calm or similar) or take magnesium separately as a capsule. The drink will taste mildly salty — that is correct. If it tastes good, you probably need the electrolytes. If it tastes unbearably salty, you are likely not depleted.

Sole water (pronounced so-LAY) is another simple approach: fill a jar 1/4 full with unrefined salt (Himalayan pink or Celtic sea salt), add water, let it dissolve overnight. The water becomes fully saturated at about 26% salinity. Add 1 teaspoon of this concentrate to a glass of water each morning. Sole water provides sodium along with trace minerals present in unrefined salt, though the trace mineral quantities are small.

How much sodium you actually need depends on your context:

• Sedentary, standard diet: 2,300-3,500 mg/day (most people get this from food alone)
• Active/athletic: daily sodium losses of 3,500-7,000 mg in hot weather, which need to be replaced²
• Ketogenic diet or fasting: 4,000-7,000 mg/day — low insulin causes the kidneys to excrete sodium rapidly
• Sweat losses specifically: vigorous exercise and warm or hot weather induce sweat production, which contains both water and electrolytes; daily water losses of 4-10 L can induce water and electrolyte deficits²

This is why a single "recommended daily allowance" for sodium makes little sense — a keto-adapted athlete training in summer heat has entirely different needs than a sedentary office worker.

Commercial options worth considering:

• LMNT: 1,000 mg sodium, 200 mg potassium, 60 mg magnesium per packet. No sugar. The sodium content is intentionally high, designed for active people and low-carb dieters.
• Liquid IV: Uses Cellular Transport Technology (glucose-sodium co-transport) with 500 mg sodium. Contains 11g sugar — the glucose is functional here (it accelerates sodium absorption via SGLT-1 cotransporters in the intestine) but adds calories.
• Drip Drop: Medical-grade oral rehydration based on WHO guidelines. Lower sodium than LMNT but evidence-backed formulation.

What to avoid: Traditional sports drinks like Gatorade deliver 160 mg sodium and 21g sugar per 12 oz — that is more sugar than electrolytes, essentially expensive sugar water with food coloring. If the first or second ingredient is sugar (dextrose, sucrose, high fructose corn syrup), it is designed to sell, not to hydrate.

Baker and Jeukendrup (2014) reviewed the fundamental aspects of body fluid balance and the physiological consequences of water imbalances, and discussed the considerations for the optimal composition of a fluid-replacement beverage across a broad range of populations (including military, athlete, and occupational groups) and situations (including heat stress and recreational exercise)⁵. They discussed how beverage carbohydrate and electrolytes impact fluid replacement, and concluded that the optimal fluid-replacement beverage is customized according to specific physiological needs, environmental conditions, desired benefits, and individual characteristics and taste preferences⁵. For active athletes, Shirreffs and Sawka (2011) note that vigorous exercise and warm or hot weather induce sweat production, which contains both water and electrolytes, and that daily losses of 4-10 L of water and 3,500-7,000 mg of sodium during hot weather exposure can induce water and electrolyte deficits². These can be replaced by normal eating and drinking if there is no urgency, but rapid recovery (under 24 hours) or severe hypohydration (over 5% of body mass) calls for aggressive drinking of fluids and consuming electrolytes².

Rosner and Kirven (2007) established that exercise-associated hyponatremia is preventable with appropriate sodium intake during prolonged exercise. Their clinical review documented that the incidence of EAH in marathon runners ranges from 13-22% when defined as serum sodium below 135 mmol/L, making it far more common than most athletes realize. The primary risk factor is excessive intake of hypotonic fluid (water or low-sodium beverages) relative to losses. They recommended that endurance athletes consume sodium-containing beverages rather than plain water during events lasting longer than 1-2 hours¹.

De Baaij et al. (2015) reviewed magnesium absorption from oral sources, noting that magnesium bioavailability varies significantly by form. Magnesium oxide, despite being the cheapest and most common supplement form, has bioavailability as low as 4%. Magnesium citrate and magnesium glycinate show substantially higher absorption rates (25-30%). For electrolyte drinks specifically, magnesium citrate dissolves readily in water and is well-absorbed. They noted that splitting magnesium supplementation across multiple smaller doses throughout the day improves total absorption compared to a single large dose, as intestinal magnesium absorption becomes saturated at higher concentrations³.