
Vodka is a neutral spirit, distilled until almost nothing of its own flavor is left. It can be made from grain, potato, grape or nearly anything else fermentable.
Light white rum
The closest swap, in the same amount. It stays in the background and adds a soft cane note.
Gin
Swaps one for one where its botanicals fit.
Flavored vodka
Stands in for plain vodka only where that flavor suits the drink.
Neutral grain spirit
Cut it with water first: two parts to three of water bring 96% down to about 38%, close to vodka strength.
Aged or strongly flavored spirits (whiskey, dark rum or tequila)
Not substitutes: they rewrite the drink.
An opened bottle barely changes on the shelf. There is no sugar, no wood and almost no aroma to lose, so it is the same drink a year later. Keep it wherever it is convenient; the freezer is a matter of preference, not preservation.
French Martini – IBA
Vodka