Diet coke and tea can't take the place of water. Both can dehydrate you while the purpose of water is to rehydrate you. If you are drinking alot of tea and coke, youshould probably be drinking even more water. the asperteme in diet coke can also cause problems for some people, while others have no probs.

What you can do is pick up some carbinated water (seltzer?) and some DaVincci syrup that's cola falvored.

What works best for me is to make sure the water is ice cold from the fridge. Then I fill a water bottle and just sip from it all day. I can't sit down and chug an entire glass of water all at once. Many find upping thier water intake helps not only with weight loss, but over all feeling good like adkpam mentioned. I know if I get short on water I get headaches. As for it makes you pee alot, well that's a good ay to get toxins out of your body, and after a while your bladder adjusts so you aren't always living in the bathroom.