PlogLod

It just annoys me because I'm not going to order it and I'm abstaining from alcohol. But there's always some "special deals" being advertised by UberEats on alcohol, as well as meat, dairy and eggs. It's like they're really sleazy and desperate to hawk these products.

How do you say something like that?

"There's a thing for which I don't know what it is" "There's a thing where I don't know what it is" "There's a thing that I don't know what is"

or (the one which I hear people say a lot but sounds awkward:) "There's a thing that/which I don't know what it is"?

To be honest they all sound awkward to me to varying degrees