I used to drink a lot of crystal light as well ... they are so good! But, I kinda used them as a stepping stone to try and drink more water. Now that I am drinking lots of water I try to use them less and less and now I just have them in the house for times of weakness. Just knowing that they are there and that I could have them, makes me crave them a lot less.
Crystal Light has Aspartame in it which is known to cause cancers and autoimmune disorders. I would highly recommend NOT drinking anything that uses artificial sweeteners. Try bubbly water and squeezing lemon or lime or orange into it. Much better for you without the use of artificial sweeteners!
Another thing to consider is that I have gotten MAJOR migraines from drinking or eating anything with sugar substitutes. If anyone is getting headaches and is drinking/eating anything with sugar substitutes (including gum!), that could be a major factor why.