Water. If you can wean yourself off your caffeine dependency, being well hydrated will keep you awake better than caffeine - without crashes, withdrawals, or i

Water. If you can wean yourself off your caffeine dependency, being well hydrated will keep you awake better than caffeine - without crashes, withdrawals, or ill effects on your sleep. Sugary caffeinated drinks will compound the high->crash effect. And cause you to put on weight. And screw with your metabolism (putting you at risk for diabetes). I also like to drink tea, iced in summer. One cup caffeinated in the morning (a cup of tea has half to a tenth as much caffeine as a cup of drip coffee). Unlimited herbal and decaf in the afternoon. Zero calories, or 5 per cup if I add milk. No sugar. If you need flavor and fizz to enjoy your drinks, may I suggest the flavored seltzers such as LaCroix that are now all the rage?