Published: September 14, 2026 | By the SurferFood Editorial Team
Choose water for a short, cool session. Choose a carbohydrate-electrolyte drink when the paddle is long, the air is hot, or you are a salty sweater. The American College of Sports Medicine's 2007 fluid-replacement position stand says the goal during exercise is "to prevent excessive (>2% body weight loss from water deficit) dehydration and excessive changes in electrolyte balance to avert compromised performance" [1]. A 2021 review in the Journal of Human Kinetics reported that a 2% body-weight fluid loss can cut high-intensity endurance by about 10% [2]. A logo on a bottle does not create that protection. Fluid, sodium, and sometimes carbohydrate do. If we mention a powder from the gear page, that page uses affiliate links and says so.
Key takeaways
- ACSM's 2007 stand aims to keep body-weight loss from fluid under about 2% and to limit large electrolyte swings [1].
- A 2021 review reported about a 10% drop in high-intensity endurance at 2% dehydration [2].
- Water plus a salty meal is "real hydration" for most single, cool sessions.
- A 6 to 8% carbohydrate drink can help when work runs past about 70 minutes, in line with ISSN during-exercise carb ranges [3].
- Seawater is not a sports drink. Neither is an energy drink used as your only bottle.
The Split
What is "real hydration" on this page?
Real hydration means enough fluid and sodium to replace what you lost, plus food when you need carbohydrate. It does not mean "only tap water forever" and it does not mean "only branded drink mix." Coconut water, milk, broth, and a salty rice bowl all count. A sports drink is one convenient way to combine water, sodium, and sugar. It is a tool. It is not a personality.
Compare
Sports drink, water, or food-first?
Pick the lightest option that matches heat, session length, and your stomach.
| Option | Best for | Watch-outs |
|---|---|---|
| Plain water | Cool, 45 to 75 minute sessions after a normal salty meal | Not enough sodium on a hot double session if food is delayed |
| Water plus salty food | Most recovery windows. The meal carries sodium and carbs. | Harder mid-session if you cannot come in to eat |
| Carbohydrate-electrolyte drink | Long or hot paddles, or when you will not eat for a while | Sugar can sit if you chug it. Read the sodium, not the flavor. |
| Low-sugar electrolyte mix | Hot days when you already ate enough carbohydrate | Does not refill glycogen. Still need food for a second session. |
Do surfers need sports drinks, or is water enough?
Water is enough for many weekday sessions. ACSM still wants you to start the work already hydrated, about 5 to 7 mL per kg at least 4 hours out, then add more if urine stays dark [1]. That protocol does not require a branded mix. It requires a bottle you will finish.
Sports drinks earn the slot when sweat loss will be high and food is inconvenient. ACSM discusses beverages with about 20 to 50 mEq of sodium per liter, roughly 460 to 1,150 mg per liter, to help you hold the fluid [1]. If the label has 50 mg of sodium in 20 ounces, that is flavored water. Look at milligrams, not the lightning bolt.
When does carbohydrate in the bottle matter?
When the session runs long. ISSN's nutrient-timing stand supports about 30 to 60 grams of carbohydrate per hour during prolonged hard work, and more in some endurance settings [3]. A 6 to 8% carbohydrate drink is the classic sports-drink range because it usually empties from the stomach without turning into syrup.
A 45-minute dawn patrol after breakfast does not need that. A three-hour weekend in a summer steamer might. Our homemade energy gels cover the chewable version of the same idea. Do not stack a gel, a soda, and a sports drink just because the packet said "endurance."
How do you hydrate without a sports drink?
Drink water on ACSM's timing, eat something salty, and replace more than you think after you rinse. A rice bowl, soup, or pretzels plus fruit can match a bottle of mix for sodium and carbohydrate. That is real hydration. It is also cheaper. The CDC's extreme-heat guidance steers people away from alcohol and very sugary drinks when they are trying to stay ahead of heat [4].
Coconut water is a middle option. It has potassium. Sodium is often lower than a dedicated mix. Treat it as a pleasant drink, then add salt from food if you were a salty sweater. For chewable sodium ideas, use electrolyte snacks for summer surf.
What should you skip?
Skip seawater. Skip using an energy drink as your only fluid. Skip a last-minute liter of anything. Our hydration timing post covers the clock. This page is the product-versus-food decision sitting on top of that clock. If you buy a mix through our gear page, that page discloses affiliate links. A grocery-store table salt in a water bottle is still allowed.
This article is educational and is not medical advice. It is not a treatment plan. If you have a medical condition or take medicines that change fluid, salt, or food needs, talk with a qualified clinician.
Frequently asked questions
Are sports drinks better than water for surfing?
Not for every session. Water is enough for a short, cool paddle if you already ate something salty. A sports drink helps when it is hot, the session is long, or you will not eat soon. The useful parts are fluid, sodium, and sometimes carbohydrate, not the brand.
How much sodium should a surf drink have?
ACSM discusses about 20 to 50 mEq of sodium per liter in a pre-exercise drink, roughly 460 to 1,150 mg per liter. Sweat sodium varies widely, so this is a range, not a personal prescription. Check the label in milligrams.
Can I hydrate with food instead of a sports drink?
Yes for most recovery windows. Water plus a salty meal replaces fluid and sodium just as a bottle can. Mid-session, a drink is easier if you cannot come in to eat. Food-first still wins after you rinse off.
Do I need carbs in my drink during a surf session?
Only when the paddle runs long or you skipped food. ISSN lists about 30 to 60 grams of carbohydrate per hour for prolonged hard work. A 45-minute session after a normal breakfast usually does not need a sugary bottle.
Is coconut water a sports drink?
It is a potassium-rich drink, not a complete stand-in for every sports mix. Sodium is often lower than a dedicated electrolyte formula. Use it if you like it, then get salt from food when sweat loss was high.
Should I drink seawater or an energy drink instead?
No. Seawater is far too salty to use as drinking water. Energy drinks are a caffeine delivery system, not a hydration plan. Use water, a measured electrolyte drink, or water plus a salty meal instead of either shortcut.
Sources
- [1] Sawka et al., "Exercise and Fluid Replacement," ACSM Position Stand, Medicine and Science in Sports and Exercise, 2007 - https://doi.org/10.1249/mss.0b013e31802ca597
- [2] Judge et al., "Hydration to Maximize Performance and Recovery," Journal of Human Kinetics, 2021 - https://pmc.ncbi.nlm.nih.gov/articles/PMC8336541/
- [3] Kerksick et al., "ISSN Position Stand: Nutrient Timing," Journal of the International Society of Sports Nutrition, 2017 - https://pmc.ncbi.nlm.nih.gov/articles/PMC5596471/
- [4] CDC, "Extreme Heat: Prevention" - https://www.cdc.gov/extreme-heat/prevention/index.html
Next Step
Time the Bottle, Not Just the Brand
Sports-drink chemistry only helps if the fluid goes in on time. Use the hydration timing plan for the hours around a session.