Here are some more appropriate ways to express the idea of having a drink or two in French, depending on the context:
For a casual, light-hearted suggestion:
* On va boire un coup? (Let's have a drink?)
* On se fait un verre? (Let's have a drink?)
* On va s'enfiler un verre? (Let's have a drink? - slightly more informal)
If you want to emphasize having fun and enjoying the evening:
* On va s'amuser un peu? (Let's have some fun?)
* On va faire la fête? (Let's party?)
For a more formal invitation:
* Voulez-vous prendre un verre avec moi? (Would you like to have a drink with me?)
Remember:
* The appropriate phrase will depend on the context and your relationship with the person you are talking to.
* Always be mindful of the social norms and avoid being overly suggestive or disrespectful.