What kind of soda should I use?
Use soda water or club soda. Club soda has added minerals that can taste slightly saltier or brighter (brand dependent), which I like. Avoid tonic water unless you want the quinine bitterness and extra sweetness.
What is the best vodka-to-soda ratio?
My sweet spot is 2 ounces vodka to 4 to 6 ounces soda water. For a stronger drink, use 4 ounces soda. For a longer, lighter highball, use 6 ounces soda.
Why does my vodka soda taste bitter or “hot”?
Usually one of three things: not cold enough, not enough ice, or low-quality vodka. Chill your glass, use lots of ice, and try a smoother vodka. A squeeze of citrus and a pinch of salt can also round out the edges.
Can I use flavored seltzer?
Yes. Just watch sweetness if it is a flavored soda rather than seltzer. Citrus, berry, and grapefruit flavors are especially good with vodka.
How do I make it less boring without adding sugar?
Add citrus zest, a few cucumber slices, a couple dashes of bitters, or a tiny pinch of flaky salt. Those are all big flavor with basically no sweetness.
What is that “salty grapefruit” variation?
Swap the lime for a grapefruit wedge (or 1 to 2 teaspoons juice), add a tiny pinch of kosher salt, and garnish with a grapefruit peel twist if you have it. It is bright, a little savory, and weirdly addictive.
Is there a pitcher version?
Yes, but add the soda water at the end. Pre-mix vodka and citrus, chill it, then pour over ice and top each glass with fresh bubbly water.