This may not help a lot - but I remember having problems with the same thing. When I read the directions again and found the correct bucket/tub of water it worked and it was like 'duh'. Try reading it again, I think it is under the table though.
Yes, must drag and drop pans & plates into inventory - that was the key! Then talk to cook! I had to go do it again to remember. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />