In my experience, yes, the scale can and does fluctuate with water weight quite a lot depending on some things. Some reasons for the bloat can be TOM, increased sodium, and even a tough work-out with weights. Or any combination of these things can add up and nudge the scale up temporarily.
For me, salty food (sushi with soy sauce for example), along with TOM can cause me to bloat up 2-8 pounds with water weight. Last month I went for a whole week near my TOM where I ate whatever I wanted, and drank whatever I wanted. By the end of just over a week, I had packed on 10 pounds!
But, it was 98% water weight in my case and it all came back off the next week when I went back to eating right and so on.
I know this is easier said than done, but try not to get discouraged when you see these blips. They happen. Just keep doing what you should, ride it out, and the water weight will drop off pretty quickly. (It also takes an extra pound or two along with it as a bonus, too.