The phrase "a cup of coffee together" is correct and usable in written English.
It can be used when suggesting or inviting someone to share a coffee with you, often implying a casual meeting or conversation.
Example: "How about we meet for a cup of coffee together to discuss the project?"
Alternatives: "a coffee date" or "sharing a coffee".
He pulls him over, and they agree to have a cup of coffee together.
"But we could still have a cup of coffee together at Dunkin' Donuts".
Still, if the history of virtual communications is any guide, the more business people communicate with high-technology tools, the more likely they are also to want to have a cup of coffee together or make small talk during a pause in a face-to-face conference.
For example, a commercial for the Kraft Foods coffee brand Jacobs Krönung, which aired in Germany in 2011 and 2012, showed a man facing various domestic challenges (washing dishes, sewing a button on a jacket, dicing an onion, and making a bed) while a group of women enjoyed a cup of coffee together.
Even better, have a cup of coffee together.
I love your work and it would be great to grab a cup of coffee together".
With some time remaining before Monica and Chandler leave for their new house, the six all leave their keys to the apartment on the kitchen counter and decide to go for one last cup of coffee together, although it is only implied and never stated that this will be at Central Perk.
"A cup of coffee, an apéritif together, maybe".
It can be having a cup of coffee or tea together first thing in the morning while you talk about what you have planned for the day.
They also point out, proudly, that curling is the only game in which opponents shake hands before and after matches, then usually have a cup of coffee or a beer together.
"Craig Bellamy texted me yesterday [Tuesday] and said let's have a cup of coffee so we got together and had a chat.
