Olive brine is simply the juice that cocktail olives are stored in.
There are bartenders who swear by gin up and down the coast in place or vodka, and those who ardently defend vodka. The thing is– they’re both right, so try both!
You can also cut the vermouth in half – adding just a splash to get a little kick without overpowering the drink. You might add a touch more olive juice in place of the vermouth. [7] X Research source