You can buy any flavor of unsweetened Kool Aid you like & sweeten it with Splenda for a change of pace. Splenda measures the same as sugar. Crystal Light Mix contains the dreaded aspartame & is more expensive than this route, plus there are fewer flavor choices. Just make sure you're still getting the water you need (min 64oz daily), diet soda or other drinks don't count towards this. Diet Rite is caffeine free & sweetened with Splenda so as far as soda goes it's your best bet.
God Bless,
Amy-Lynne