If I see that same Cast Member I will do my best to try and find out that information.
When I was told about them not selling the mugs, I then said so it would be just like the times when there were temporary counter service locations at the Polynesian and Wilderness Lodge. So for anyone who was at those Resorts during those times you know what I am talking about, you would know what types of food they would sell.
As for how much the the 20oz bottles cost, at the parks the total was $2.00, however I am not sure if that was the same price at the Contemporary and other WDW Resorts.
I would imagine that there will be hundreds on the DDP at the contemporary between Jan and Apr/May 2008 (when the Food N Fun work in done). They will get a lot of complaints if they do not offer any alternative to the Mugs as people staying at every other resort will be better off.
Hope you can find out some info as we are travelling to the CR on the DDP in April 2008.

For a family of 4 I would imagine that they will be $50+ worse off on the DDP without the mugs.