Now back to my point. Dehydration was an issue for me and now, as I try to drink my eight 8 oz. of water a day (or something around that) I find it incredibly difficult to drink enough...from a glass that is. I bought a water bottle over the summer that has markers for the amount of ounces: 8 oz., 16 oz. and 24 oz. The amazing thing is, I have almost no difficulty drinking water from this. I can drink a full 8 ounces in one go if I want to and not have an issue.
The water bottle is a Camelbak bottle: http://www.camelbak.com/Sports-Recreation/Bottles/Better-Bottle-75L.aspx
I think the bottle's "Flip, Bit-N-Sip", no tilting necessary top, is the key to why it's so easy to drink from...
Needless to say, I highly recommend this bottle for the above reason. It's kept me hydrated and since I'm hydrated, my mind is off my favorite, but unhealthy and will do me no good, drink.
The rule about drinking that most (not all) people seem to agree on: Drink at least eight 8-ounce glasses of fluid a day.