A foster home with no other cats is desperately hard to find. But here is a link to another Siamese recsue. They are in PA but their site says they have foster homes in CT.
http://www.petfinder.org/shelters/PA89.html

One of our board members is in constant contact with them, so just as added strength tell them One by One cat rescue gave you their name. You never know, it might help.

Also, search the internet for any and ALL Siamese rescues and just email until you get a response.

GOOD luck.