Crystal light won't affect the stall. The stall is your body's way of adjusting. Mine lasted two and a half weeks and some have lasted up to several months for others. You want to up protein and be patient. I drank Crystal Light and still do but alternate between that and plain water, with plain water being my main source of liquid. You shouldn't have any restriction on liquid at all. I did cut out the protein shake, which helped me, not sure how much meat you eat so feel unsure you want to cut that out. Walking more now helps, and I'm losing a pound a day. I have no issues, even eating one small scoop of ice cream with a cookie last night, and waking up a pound and a half lighter. (First and last time eating ice cream for a long time, I had no dumping syndrome.) The stalls are hard but normal. There is no dreaded "three week stall", it's just one of several plateaus you will hit. I will say you may wish to not drink crystal light due to fake sweetener that's in it, still having said that I drink it once in a while when water is too redundant. I personally don't think you ought to return to all fluids - you need to eat every three or so hours to keep your metabolism working. It's the yo-yo dieting that ruined the ability to lose to begin with. Just stick with 1-2 oz of food. Measure out 4oz, put half away and eat when you feel hungry. My doctor told me to expect a severe stall after I started solid food and that's exactly what I got. I'm down 53 pounds since May 1st. Good luck.