Yep- just mix 1/2 fruit juice and 1/2 plain seltzer water in a big glass with some ice....refreshing! To make it less calories still, use 1/3 juice and 2/3 seltzer. I think you'll find it less addictive than cola so you probably won't feel the need to drink 8 glasses a day to replace the 8 colas you were used to.
Keep up the good work- I am totally impressed!