It has taken me a while to understand what the problem is here...
The exemple you give is incorrect , in French if you want to express different types of things, you will not use the partitive "Des" but something like ,
Vous avez essayé plusieurs/différentes sortes de thé or vous avez essayé des thés différents/ divers ?
you can't simply say des thés, this would be the same for any kind of food stuff.
Not sure if this helps?
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