Where can I find rose water for cooking and champagne extract?

any good arab or greek market should have rose water, many indian markets too. do you mean chamagne vinegar? or champagne verjus (unfermented juice)

For rose water go to any Arabic or Persian grocery store. Just remember, if you are using it in food (I have heard of some people washing their face with it) use a little at a time to taste, because too much can taste gross. As for champagne extract try a specialty food store like Cost Plus or any other that has imported foods.