Will Plain Water Hydrate You at a Festival?

You've packed everything you think you need: your tent pegs, wellies and a huge bottle of water. But, there's one thing missing: electrolytes. At a festival, water alone is not always enough to keep your body hydrated. When you factor in what your body is losing during those hot days of dancing to music, you'll see that plain water and hydration are not necessarily the same thing. So if you're looking to stay hydrated over a festival weekend, here's what you need to know.

Heat

Festivals happen in the hottest months, and heat drives up your sweat rate fast. A 2025 study found that the effect of increased heat on workers was the single biggest driver of electrolyte depletion. Simply put, the more you sweat, the more sodium and other electrolytes you lose.

Increased physical exercise

Dancing for hours and walking for miles will also add to your sweat losses and electrolyte depletion.

Alcohol

A study from the Journal of Applied Physiology found that stronger alcoholic drinks measurably slow down rehydration. And crucially, they also don't replace lost electrolytes either.

Eating less

Skipping meals means missing out on a major source of your daily electrolytes, mainly sodium and potassium, nutrients that you're already losing more of through sweat.

What Are the Symptoms of Electrolyte Imbalance and Dehydration?

Knowing the signs early makes all the difference. Keep an eye out for:

• Headache
• Fatigue or low energy
• Dizziness or lightheadedness
• Dry mouth or unusual thirst
• Dark yellow urine
• Muscle cramps
• Confusion or difficulty concentrating

Mild dehydration is more common and easy to spot once you know the signs. If symptoms feel severe, such as confusion, fainting, or an inability to keep fluids down, seek medical help. Most UK festivals have a designated medical area for exactly this.

Plain Water and Hydration: Why Isn't It Enough?

Plain water doesn't replace the electrolytes we lose in sweat; that's because sweat isn't just fluid. Sweat also contains sodium, potassium and chloride. So if you're only drinking water, you are not addressing the loss of those electrolytes.

Drinking excessive amounts of plain water is bad for your body, too, and it's where some festival-goers might get hydration wrong this summer. If you drink a lot of plain water without replacing sodium, you can dilute the sodium already in your blood, a condition called hyponatraemia. According to Kidney Research UK, electrolyte imbalance symptoms like this can range from headaches and nausea to seizures in severe cases. It's rare, but it's a real risk when people over-hydrate on plain water during long, sweaty days.

But how do electrolytes contribute to hydration? Sodium, in particular, helps your body regulate fluid levels throughout your body. That's why a rehydration drink with the right sodium content can be more effective at restoring fluid balance after exercise.

How else do we lose electrolytes? At festivals, there are lots of other ways we might lose electrolytes and fluids from our bodies. Illness, diarrhoea and vomiting will all flush out electrolytes from your body quickly.

The Benefits of Electrolytes for Dehydrated Festival-Goers

The benefits of electrolytes go beyond just replacing what sweat takes away. Each one plays a specific role in keeping your body functioning properly.

Electrolyte Tablets Vs Alternatives

So how do electrolyte tablets actually compare to other hydration drinks? One study compared water, a sports drink, and an electrolyte drink to assess how effectively they rehydrated someone with exercise-induced dehydration.

The electrolyte solution came out well ahead. Plain water rehydrated the slowest out of all three, while the sports drink landed somewhere in the middle.

That's why our electrolyte bundles can be so helpful for faster recovery at festivals.

What's in Our Electrolyte Tablets?

Our everyday tablets are a scientifically balanced blend of electrolytes, helping you to hydrate faster and for longer. Formulated by pharmacists, they're perfect for getting the most out of an active festival weekend. These tablets suit people who need a quick hydration boost.

Ingredients
(per 2 tablets in 200ml of water)

• Potassium 193mg: Potassium contributes to normal muscle function and normal nervous system function.
• Sodium 277mg: Sodium contributes to normal fluid balance and is an important electrolyte lost in sweat.
• Chloride 352mg: Chloride is an important electrolyte involved in normal fluid balance and acid-base balance.
• Glucose 3.27g: Our tablets contain a small functional dose of glucose, which helps enhance electrolyte absorption to hydrate you faster.

Other Hydration Myths

• "Only athletes need electrolytes." Electrolytes are for everyone. From elite athletes to everyday people, electrolytes are essential for our bodily functions, and replenishing them is important.
• "The best electrolyte brand is the one that has the most sodium." A lot of people think the best electrolyte drink is the one with the most sodium. Here's why a drink with too much can actually be a bad thing.
• "More water is always better." Too much plain water without electrolytes can dilute your sodium levels rather than help.

FAQs

Does plain water hydrate you, and how much should you actually drink?

Plain water can replace the fluids you lose in sweat, but not the electrolytes. It is still important to drink, but the right amount depends on heat, activity level, and body size. Sipping steadily throughout the day, rather than chugging occasionally, is more effective for staying hydrated.

Do you still need electrolytes if you're not drinking alcohol?

Yes. Heat, dancing, and skipped meals all deplete electrolytes on their own, regardless of alcohol.

What happens when you have too many electrolytes?

When we supply our bodies with electrolytes, they're very good at maintaining a balance, with excess electrolytes being excreted in urine and sweat.

Are electrolyte tablets allowed at festivals?

Yes. Tablets are solid, so they're festival-security-friendly and don't count against any liquid restrictions the way pre-mixed drinks might. However, if you're unsure, check on your festival's website.