This link has a good interactive map that shows current water levels.

http://dds.bangkok.go.th/Canal/

There's a high tide due early Thursday morning so that will be a good test of the flood defenses.

Check out this map over flooded areas in and around Bangkok:

There are good updates and maps as well to and info on what roads are flooded and not.

http://www.thaitravelblogs.com/2011/10/map-of-flood-risk-areas-in-bangkok/

All big bottles of water are finished at tesco lotus Onnut and today we went to Villa Market in Paradise Park, Sri nakarin. The only water left there was the "Evian"bottles.

Finally found a few 1,5 liter bottles at on PTT station.

Also Nestle, who usually delivers water to our building sent an sms in thai. I think it say, they are not delivering any water around town this week, but i'm not sure.

And yes its high tide on thursday because it's fullmoon.

Take care and stay safe!