Thanks for the tips, everyone! I have upped my water intake for the day (I've already had 32 oz and I plan to hit 100oz by the end of the day), so hopefully it'll shed right off. I've had some exercise today already, but I'll try to get some more.
I think the water weight gain this time is due to a number of things: 1) TOM coming up soon, 2) I made a lovely baked ziti dish a few nights ago, and had plenty of leftovers to supply me for the weekend (this was within my WW points, but probably was a bad choice for water gain, in retrospect), and 3) I haven't been getting as much sleep and/or exercise as I should.
Thanks for the tips, though! I'll let you know how it goes (if I ever get to leave the restroom again