Preventing dehydrationYou should drink plenty of clear fluids such as water, diluted fruit juices or oral rehydration salt solutions such as Dioralyte®. These can be bought in pharmacies and supermarkets.
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It's no secret that flying can wreak havoc on your hydration levels, but according to the Aerospace Medical Association, you should be drinking eight ounces of water every hour you're in the air to prevent dehydration.
Before you leave home, drink beverages that are high in electrolytes, typically those used by athletes. These include Gatorade, Powerade and Lucozade. Resource Water is another good example as it has water and electrolytes.