Water has no taste. My mom says that even as a baby, she had to put maple syrup or honey in my water to get me to drink it.
Also, bear in mind that I don't drink a lot anyway. I don't drink with/after each meal, and I rarely, if ever, get thirsty. Before becoming health conscious, on average, I would drink one cup of coffee a day, and I may drink about 8 oz of sweet tea, or maybe nothing else after that morning coffee.
So it's not just the fact that I don't like water, it's also that I'm forcing myself to drink when I'm not even thirsty.