British · Bombay Sapphire
Bombay Sapphire is made by vapour infusion, which means the spirit passes through a basket of botanicals as vapour instead of soaking in them. It comes out lighter and more floral than a classic London dry, with the juniper sitting back rather than leading.

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The one thing that matters
Because it is light, it needs a tonic with some bite. A full-sugar Indian tonic works better here than a light one, which can leave the drink tasting thin.
Fill a tall glass to the very top with ice, pour two ounces of Bombay Sapphire over it, then add four to five ounces of tonic slowly down the side of the glass. Squeeze a lime or lemon wedge and drop it in. Stir once, no more.
Roughly 170 to 200 calories for a standard two-ounce pour with full-sugar tonic. Almost all of that is the tonic, not the gin. Switching to a light tonic takes it closer to 130.
The gin has none. A five-ounce pour of regular Indian tonic carries about 12 to 15 grams. If sugar is the concern, the tonic is the only thing worth changing.