The other day Beck and I were talking about coffee and soft drink, and why it is not good for us.
I had done some research and found this site which explains a little. But also from my knowledge since starting my job i learnt that every cup of coffee and tea that we have we dehydrate our body half a litre of water! to every 30kgs you are you should have 1 ltr of water...
Check this site out its vert interest