Food52 has a number of great looking non-alcoholic drink options, here: Drinks & Cocktails on Food52 – Shop Spirits, Shrubs, Mixers & Bitters.
This is for a rose, but there is a gin and some sparking beverages. They have some other good products too, if you want to make something with your favorite alcoholic beverage.
Flowers from grocery stores and other such places are often uninspiring. Sure, you could take them home and stick them in a vase and be done. Or you can go over to this post and get some better ideas on how to make even a few stems of anything look beautiful: How to make basic flowers into something beautifulHow to Arrange Grocery Store Flowers | A Cup of Jo
The photo above is just one example. Go to A Cup of Jo to see some other smart examples.