Another myth that I have heard:

Is that if you are dehyrdrated you would be worse off drinking soda because it has caffiene in it. I've read recently that that is not true. After doing a study they determined the end result after the body has processed the caffiene is you would still get a net 70% (if I remember right) increase in water. Not as good as drinking 100% water, but still better than not drinking it at all...