Slowly pour the sparkling water on top. If you do this carefully enough, you’ll be able to create a vinegar layer at the bottom and the sparkling water in a layer above (because the vinegar’s more dense…SCIENCE). This makes the flavor more intense as you keep sipping. Or, just stir it all up!
Garnish with your choice of fresh fruit or herbs.
You can experiment with different amounts of vinegar. 4 parts sparkling water : 1 part vinegar was where my tastebuds were happy, but you may want more or less.