Problem is that many people have adverse reactions to Asparateme (or nutra sweet). I don't. I can drink Crystal Lite powder (or store-brand) and seem to not lose ketosis and continue to lose weight. Now I only drink about 12 oz a day at most so maybe if I was drinking higher quantity it would affect me negatively.

You should try to keep water as your bevarage of choice...drinking diet drinks and/or soda once in a while perhaps during a meal. I find that the more of the artificial stuff I drink the less water I drink. Good luck.