Hi, gals! I wanted to say welcome, and throw in a couple of thoughts. First off, a stall isn't a stall until you've gone at least 4-6 weeks with no weight loss OR no inches lost. Example: Between January and May I lost not one pound or even so much as a quarter of an inch in size, equals stalled big-time. During the past few weeks I've been packing to move and while the scales are going up and down between 202 and 204, my pants are still getting way looser--I'm losing size--ergo, no stall!
Water weight fluctuations, while they don't normally show up during Induction (but can as you've found out) are normal--they happen and will drive a person nuts. If you're going to be a scale junkie (like me) get used to it or you'll be stark-raving mad within a week!
It's also very normal for weight loss to fluctuate between two or three pounds for a while, then all of a sudden drop 4-6 pounds in just a few days. The weather also has a huge affect on water weight--as in the hotter it is the more our bodies like to hang onto their precious water. I notice that once the temp gets below 90 I lose several pounds overnight that stay off until the temp gets back above 90.
If you eat something off plan, you can expect to see some temporary water weight gain. There's no way two or three cookies can make you gain 3 pounds of fat overnight, but they can sure make your body harbor water!
Best thing to do to stay away from that kind of thing is NOT to have cookies or other things off plan. If you need a treat, look in the recipe section and you'll find plenty of nummy things to help keep you on plan but at the same time satisfy the sweet tooth. We 'treat' ourselves about once a month to cheesecake.
Geez, this is getting long so I'm going to shut up now!