In informal English, you can ask a question like, "Tea?" as a shorthand for "Would you like some (more) tea?"
I was wondering if the same can be achieved in (informal) Chinese? Something along the lines of 《茶吗？》
Sure it is, in oral Chinese, you can question someone if they care for tea like
You do not need 吗 as the question marker.
When you use this expression, please make sure, first, both you and the person you are asking are in the same and easily understandable context, like, you holding a teapot and an empty cup in front of that person; second, the person you are asking had better be in a relatively equal standing with you, this is a very casual way of asking!
In this case, I probably brief it as: 要茶吗？; 喝茶吗？; 来点茶？
These phrase are more clear in the context.