As for the "potty breaks" - I have a bladder condition, so no matter what I have a hard time drinking that much water because I definately am not productive. I can't drink what most people do, but I have tried and it does die down after a week or so.
As for the bloating. The diet root beer can be very bloating. If you can swing it -I'd try to cut it out (as well as all artificial sweetner's). They are so bad for you, and your body actually craves more sugar when you drink them. Check your salas dressing for the sodium content, but I doubt one or two tablespoons of that would do it. I usually just use balsamic and olive oil, but I don't think that should cause a problem.
Are you eating a lot of beans or any lots of fiber? My thinking is that if your eating healthier -you are no doubt increasing your fiber. I've heard them mention watching your increase and doing that slowly, but if you are ok with the bloat just ride it out till your body gets used to it. Keep up with that water. You should feel better soon. Maybe try some lemon or ginger in your water - this could help flush you out.
Also -your body is releasing a lot of toxins as it gets used to this new healthier eating pattern. Give it time and keep at it. Your body will adjust.