Ginger Ale is really nice on flights.

It lacks the caffeine of Coke and Tea/Coffee and lacks the complete lack of taste of water. It does have sugar which is both a blessing or curse depending on if you want to sleep NOW or you want to sleep in like an hours time (sugar's lows make you sleep like a baby ).

I think your comfort on the flight will be directly related to your height. If you are over 5.9 then forget it, just take a sleeping pill and hope your lower leg is still attached when you wake up. Unless you pay 300% and upgrade to business.