The sodium (not actually salt – or at least, not sodium chloride) in a coke might make you thirstier, but the caffeine probably won't. While caffeine is a diure

The sodium (not actually salt – or at least, not sodium chloride) in a coke might make you thirstier, but the caffeine probably won't. While caffeine is a diuretic, studies have not supported the idea that it causes dehydration, and it's generally accepted that the amount of water in coffee (which has a far higher caffeine density than coke) is enough to offset what you lose to its diuretic effects.