The air in airplane is very dry and it therefore is important to drink a lot to keep body hydration. When you fly economy I recommend buying a bottle of water just before boarding (after the security check) so that are independent from the beverage service inside the plane and drink whenever you want.
By the way, extra water will stop your blood from thickening and it therefore helps to protect you against DVT (Deep Vein Thrombosis). This is especially true since you will also go to the washroom making you exercise a little bit.
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