I've decided it's time to get a good water filter for my kitchen faucet so I can make sure I drink more water. I talk a lot at work, so I'm always drinking some kind of liquid. Water the most, but still some sodas for the caffeine on longer days. But I did make the switch there to Coke Zero, so at least no sugar. Being of southern descent, I also go for iced tea. I have a Mr. Coffee tea maker and it's great. Tea is good for you, so there's that benefit as well. On a long day of work I'll easily go through 2 quarts. I must say, this particular maker was well built. I've had it since 1995. Had to replace the pitcher once when I accidentally froze it and it cracked when the tea expanded (Was trying to rapid cool when I was out of ice).
But yeah water ... I personally have no problems drinking lots of it as long as it doesn't have bad flavors ... my apt isn't super bad, but could be better, thus the investment in a filtration system.