People on Hacker News are having trouble believing that there are people who don't like plain water.
I'm one of them.
Even purified bottled water has a sort of bitter taste to it that I don't like. If no other liquid is avaliable, I'll take iced water. If iced or refrigerated water isn't available, I'll drink it plain.
I usually get a bit dehydrated if I only have plain water. I'm marginally better if I have mineral water. I drink like a camel if I have diet soda with ice.