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About the only thing people are likely to drink in liquid form where you lose more than you take in is alcohol.

Most people shouldn't be taking in refined sugars more than a couple times a month. That's a somewhat separate issue. There are of course other factors at play, but that has less to do with hydration and more to do with nutrition and disease.

Being an asshole won't really help your position. I tend to be snarky myself at times, but misinformation+snark == downvotes to oblivion.

You're misinformed. Caffeine does not dehydrate those who consume it regularly.

Sugar can dehydrate you if you are diabetic or have other blood sugar regulation issues. You're playing straw man games.

Caffeine is a diuretic.

Surely that only means coffee + water is not as good at hydrating you as plain water, not that it actively dehydrates you.

It has a mild diuretic effect on nonregular users, yes.

Sea water is very salty, and will box your kidneys in. It's not the same at all.

Not what I was getting at, at all. The sodium content will make you drink more water to compensate.