I've never been able to drink diet drinks at all. The Aspartame triggers migraines plus I get the shakes...honest! If you do some further research on Aspartame, it has been linked to fibromyalgia, MS and many other illnesses. I drink tons of water daily and often add slices of lemon, lime, orange, cucumbers, etc. Very tasty and refreshing in this heat!
Just an fyi in case you were not aware!